Upgrading to Internet Explorer 8 Release Candidate 1

Hello all,

Just like for previous beta releases, I am going to guide you through the upgrade steps for Internet Explorer 8 Release Candidate 1 (IE8 RC1).

Before we begin, let me summarize the major changes you will see when installing IE8 RC1:

  1. If you are a Windows Vista or Windows Server 2008 user and you are upgrading from IE8 Beta 1 or Beta 2 to IE8 RC1, you are no longer required to manually uninstall earlier IE8 builds. Instead, IE8 RC1 installer will automatically upgrade your machine from the earlier IE8 builds to the latest IE8 build, all with a single reboot.
  2. There is a new pre-requisite for IE8 RC1 (KB957388). This update supersedes KB943302 and KB957055 and will be automatically installed as part of your RC1 upgrade, as long as you keep “Install the latest updates” checkbox checked. This update addresses known application compatibility issues in Windows Vista and Windows Server 2008 and improves the performance and reliability of IE8.
  3. All IE8 Beta 1 and Beta 2 users will be offered IE8 RC1 via Windows Update in 25 languages. For Windows XP and Windows Server 2003, the IE language that gets offered via Windows Update will match the base OS language. For Windows Vista and Windows Server 2008, the IE language that gets offered via Windows Update will match the Active Language that the user selected for their account.

Note: If you are running Windows 7 Beta, you will not be able to install IE8 RC1. You will get an error message saying that your operating system is not supported since IE8 already ships in Win7. The IE8 RC1 available from Microsoft Download Center is a standalone upgrade for downlevel version of the OS only: Windows Vista, Windows XP, Windows Server 2008 and Window Server 2003.

Here are some additional resources you can refer to during the RC1 installation:

Windows XP or Windows Server 2003

Getting Ready

Before you start IE8 RC1 installation, there are a couple of things to keep in mind:

  • Uninstalling IE8 Beta Versions

If you have Internet Explorer 8 Beta 2 or prior installed, the IE8 RC1 installer will automatically uninstall any earlier versions and then install the latest version of IE8 RC1 for you. You will be prompted to reboot twice. The first reboot is to remove pre-RC1 version from your machine and the second one to complete the IE8 RC1 installation. When you launch Internet Explorer, you can open the Help->About Internet Explorer dialog to see the version number 8.0.6001.18372.

  • Getting required updates for IE8 RC1

There is 1 update required when running IE8 RC1 on multi-core XPSP2 x86 computers:

KB932823 or KB946501 – This update resolves a problem in which an access violation occurs when an application exists on a Windows XP SP2-based multi-core computer. It will be installed automatically if you select “Install the latest updates” option in Setup Wizard. If this update fails to install successfully, IE8 installation will be blocked until you manually install this update from Microsoft Download Center.

Windows XP Service Pack 3(SP3) users only

The only time we encourage you to manually uninstall Internet Explorer 8 Beta versions prior to upgrading to IE8 RC1 is if you happened to install Windows XP SP3 after installing IE8 Beta.

To see if you need to manually uninstall IE8 Beta first, check these things:

  • Is your computer running Windows XP SP3?

Click on the Start Menu and then right click on My Computer and then click Properties

On the General Tab under System it’ll say Microsoft Windows XP Service Pack 3

  • Is the  Remove option for IE8 Beta grayed out?

From the Start menu, open Control Panel and click Add or Remove Programs

Select Windows Internet Explorer 8 Beta and you are unable to click on the Remove button.

If you answered yes to both questions, you will be able to install Internet Explorer 8 RC1, but once installed, you will not be able to uninstall either IE8 or Windows XP SP3 later. The Setup Wizard will warn you prior to installation:

dialog box asking

If you chose to continue, Windows XP SP3 and IE8 RC1 will become permanent. You will still be able to upgrade to later IE8 builds as they become available, but you won’t be able to uninstall them.

To avoid getting into this situation, we strongly encourage you to follow these steps before installing Internet Explorer RC1:

  1. Uninstall Windows XP SP3
  2. Uninstall IE8 Beta
  3. Re- install Windows XP SP3
  4. Install IE8 RC1

See my earlier blog post on Internet Explorer and Windows XP SP3 for more information.

Windows Update

Internet Explorer RC1 will be offered to all Windows XP and Windows Server 2003 systems that have IE8 Beta version installed and have Automatic Updates turned on in 25 languages. A prompt will appear in the notification area of the Windows taskbar when IE8 RC1 is ready for installation. The language version of IE8 RC1 offered is based on your Windows Operating System Language version. For example, if your computer is running a Chinese Simplified or German version of Windows, you will be offered IE8 RC1 in Chinese Simplified or German respectively. For any other Windows languages outside of the 25 that IE8 RC1 is available in, Internet Explorer 8 will be offered to you in English. Again, this only applies to those systems that have IE8 Beta versions installed.

Localized Versions

When installing localized versions of Internet Explorer 8 RC1 on XP or Windows Server 2003 please remember that the base language of the operating system must match the IE8 language you are trying to install; otherwise the Setup Wizard will display an error. You can install IE8 RC1 English on any localized OS Version.

More information about installing localized versions of IE8 RC1 can be found in the release notes.

Uninstalling IE8 RC1

  1. From the Start menu, open Control Panel and click Add or Remove Programs
  2. Click Windows Internet Explorer 8 Release Candidate 1 and then click Remove.
  3. Your computer will be reverted to Internet Explorer 6 + previous IE6 security updates or Internet Explorer 7 + previous IE7 security updates depending on what you had before the upgrade.
  4. You can confirm that by clicking Help, then About Internet Explorer next time you launch Internet Explorer.
  5. Be sure to check for any new security updates.

add or remove programs dialog, IE8 RC1 is selected

Windows Vista or Windows Server 2008

Getting ready

Before you start installing Internet Explorer 8 RC1, there are a couple of things you need to do to prepare your computer:

  • Uninstall Internet Explorer 8 Beta

Based on the feedback we received from you, our users, we changed the install of IE8 to automatically replace the older builds as part of the installation. You are no longer required to manually uninstall IE8 Beta builds if you want to upgrade to IE8 RC1. All you have to do is run the IE8 RC1 installer and it will automatically replace the previous IE8 build with the latest one. You just reboot at the end, and you are done.

  • Getting required updates for IE8 RC1

KB937287 – This update helps improve reliability and performance when you install or remove Internet Explorer 8 and future individual updates from Microsoft. Without this update, IE8 setup will be blocked: “Setup cannot continue because one or more updates required to install Windows Internet Explorer 8 are not present.” To check if you already have this update on your system, go to Control Panel ->View Installed updates and search for KB937287.

KB957388 – This update addresses known application compatibility issues in Windows Vista. It will be installed automatically if you select “Install the latest updates” option in the Setup Wizard.

You are now ready to install IE8 RC1. After IE8 RC1 installation is complete, the final screen of the Install Wizard indicates that Internet Explorer installation completed successfully.

After you restart your computer and launch Internet Explorer, you can open the Help->About Internet Explorer dialog to see the version number 8.0.6001.18372.

Localized versions

In Windows Vista and Windows Server 2008, we significantly improved the installation experience for localized versions of Internet Explorer 8 RC1. Unlike Windows XP and Windows Server 2003, the base language of Windows does not need to match the Internet Explorer 8 language version in order for a successful install. When your user active language matches the Internet Explorer 8 language you installed, then IE8 will appear in the desired language. You will still be able to use IE8 in all other scenarios, but it will appear in English as a fall back version.

More information about installing localized versions of IE8 RC1 can be found in the release notes.

Uninstalling IE8 RC1

  1. From the Start menu, open Control Panel and click Programs
  2. Click Programs and Features and click View Installed Updates (located in the left side menu)
    Note: The complete list of installed updates takes a moment to update.
  3. Select Windows Internet Explorer 8 Release Candidate 1 and Uninstall
  4. Your machine will be reverted to IE7 + previous IE7 security updates
  5. You can confirm that by clicking Help, then clicking About Internet Explorer next time you launch Internet Explorer.
  6. Be sure to check for any new security updates.

control panel, view installed updates is located in the lower left corner

Programs dialog viewing the installed updates, IE8 is located under Microsoft Windows updates

What do I do when I run into issues installing IE8?

Check out the knowledge base article on Troubleshooting IE8 installation. If after trying the recommended workarounds you still can’t install IE8, go to the IE Beta Newsgroup to see if there are any known solutions available. Microsoft MVPs and IE Team members are monitoring this newsgroup and they will help address your issues.

Thank you,

Jane Maliouta
Program Manager

Comments (46)

  1. IEBlog says:

    We’re excited to make the IE8 Release Candidate available today for public download today in 25 languages

  2. Microsoft hat sich vor der Veröffentlichung einer Beta-Version des kommenden Internet Explorer 8 (IE8) nun doch (einigermaßen überraschend) dazu entschlossen, die ggü. IE6 und IE7 standardkompatiblere Darstellung von Webinhalten standardmäßig zu verwende

  3. The IE Blog reports on the release of IE 8 RC1 : We're excited to make the IE8 Release Candidate

  4. JScript Blog says:

    Internet Explorer 8 Release Candidate Is Now Available . Here is post that would help you Upgrading to

  5. This afternoon, Internet Explorer General Manager Dean Hachamovitch has announced the immediate availability

  6. Too bad it won’t install on Windows 7 !

  7. Win7User says:

    Cannot update to use IE RC1 on windows seven is kind of letting windows seven beta users disappointed.

  8. TechBlog says:

    As it marches inexorably toward a final release of the latest version of its Web browser, Microsoft today issued the first release candidate for Internet Explorer 8. IE8 RC1 is available here, and it’s got some features that are new…

  9. おはようございます。五寳です。 大変お待たせしましたが、Internet Explorer 8 RC1 が先ほどリリースされました! このビルドは最終リリースに向けた、その名のとおりの位置付けのリリースで、IE8

  10. We’re excited to make the IE8 Release Candidate available today for public download today in 25 languages

  11. Works ok, nothing special, should get better with the RC2

  12. Elijah Grey says:

    Why doesn’t setting accessors work on objects? From my tests, it only seems to work on the DOM and Window.

  13. В данной версии браузера: завершена платформа. Финальная версия браузера будет вести себя как и текущая.

  14. ChiBuzor says:

    RC1 isnt uninstalling the IE8 Beta X on my machine, not sure what build it is, and its not popping up under Uninstall Programs window either (with show hidden updates selected).

    Any other way to uninstall IE8 Pre-RC1 (my guess is that I’m running beta 1)?


  15. @ChiBuzor: Use Control Panel>Programs>View installed updates. Find IE8 and click the uninstall button.

  16. Congratulations guys it seems to be running a bit faster than my IE8 beta 2.  I also like the new plug-in manager..  Maybe it was there all the time but I never saw it before today.

  17. Xepol says:

    The upgrade experience is hugely improved, which is great, because I screamed loud and long about this since IE7.  All this talk of updates seems blown out of proportion.  I did not have the update and it still worked just fine.

    The next step to is force the shell team to use a fixed version of IE through com and free the "browser" version of IE from the COM insanity that has limited and plauged it so.  Then the install process could work without the need for a reboot at all.    

    Honestly, I am not clear where IE actually gets used in the shell anymore aside from "Active Destop", so the shell team should at least examine dropping the dependancies they unwisely bolted in for IE4.  No sane person uses Active Desktop anyways, as it was the easiest way to nuke your system in a hurry.

    Chances are that every team in the place would be better off without the linkage, and it certainly would help with thickheaded lackwits such as those complaining over the EU right now.

    [Side note to the OS team working on the control panel.  You can’t use the search box to search in the applied updates.  It is annoying, inconsistant and confusing.  Search works as drill down everywhere by the control panel where it suddenly searches sideways.  Be nice if someone fixed that…]

  18. こんにちは。五寳です。 今朝のアナウンスに引き続き、 IEBlog と リリース ノート から、RC1 を利用するにあたっての重要なポイントをまとめました。 インストールにあたっての重要な変更点のまとめ

  19. Релиз-кандидат-версия браузера Internet Explorer 8 стала доступна для скачивания на 25 языках для пользователей

  20. After Paulo alerted me to the availability of IE8 RC1 (and after waiting a little while for the links

  21. IE8 Release Candidate is available for public download today in 25 languages for Windows Vista, Windows

  22. Da oggi, potete scaricare la Release Candidate di Internet Explorer 8 , disponibile anche in versione

  23. Mitch 74 says:

    Redraw and display speed seem to have been improved. Yay. Bugs with "growing" containers that have :after generated content absolutely positioned with negative bottom margins seems solved.

    However, there is a _regression_ over beta 2: if a block element has a child of which "display" status change upon element’s :hover (triggering element’s resizing), negative margins of the element don’t get properly computed on mouseout.

    Testcase still the same, number 3 of http://moneyshop.perso.cegetel.net/moneyshop/testcases.html

    Hover your mouse over the green block (it grows with a list inside), then remove the mouse: it shrinks back to initial size – but now with a red border, and following paragraph’s now much closer to the block. Resizing the window doesn’t restore it properly anymore, it needs a page reload.

    This test requires Strict Standards mode (default), not IE7 Compatibility Strict mode.

    For the sake of completeness, be aware that I run this IE inside a virtual machine that uses the standard VESA driver shipped with Windows XP sp3 with "all accelerations" enabled, then with the generic Cirrus Logic 5446 driver: both displayed the bug (three guesses to what my VM is). Considering how IE interacts with a display driver, it could change with, say, Intel, Nvidia or Ati drivers.

    It is a regression over beta 2, which didn’t have this bug (running on the same image with the same VM). Regression was already present in the Partners Build.

    Just to be sure, by using the above address, who can reproduce the bug?

  24. sb says:

    Come on… really?  I don’t have to install KB115548 or KB55448877999852abc before KB887794DEF?

    It’s Microsoft for crying out loud!  Make things a little easier for people to install!

  25. The first release candidate for Internet Explorer 8 has been released to the web. You can download it

  26. James17 says:

    I can’t seem to think of a valid reason why you wouldn’t allow users who have taken time to test out the Windows 7 beta the ability to upgrade from IE8 Beta 2 to RC1.

    I’ve taken time to test the 64 bit version of the beta and I can’t use IE8 Beta 2 primarily as it’s extremely buggy and it has crashed a few times. I was excited to hear of the RC1 release but giving it to XP and Vista users and not to the mass of people who have downloaded Windows 7 is quite unacceptable.

    Saying that new versions of IE8 will be released as newer Windows 7 builds become available is a bit inadequate.

    I don’t want to install IE8 RC1 on my home computer, I want to test it on my test machine with a test version of Windows. No can do.

  27. Hypotheek says:

    It worked! I’m going to check it out now!

  28. gabriel says:


  29. Jane [MSFT] says:


    Can you try launch IE in no add-ons mode? Go to Start->All Programs->Accessories->System Tools->IE8 (No Add-ons). If IE launches successfully this way then it’s one of the addons that is causing the issue.

    You can also check for ieplore.exe.local folder in <Systemdrive>ProgramFilesInternetExplorer or <Systemdrive>ProgramFiles(X86)InternetExplorer and if it’s present, please delete it.

    Hope this helps.

  30. James says:

    What did you do to the right-click context menu from Google? I cannot find it… It worked on IE 8 Beta!

  31. SkiN says:

    Nice Browser So Fast So Stable

  32. anon says:

    anyone else having problems with RC1 and ftp/http downloads?

  33. rikur says:

    ie8 rc1 doesn’t start here either. There’s no .local file to delete and starting without addons doesn’t help.

  34. Tim McGookey says:

    My company has been preparing our web based software for IE8 for months now, and we’ve hit a major snag in IE8 RC1.

    On nearly every machine with which we were testing, cookies weren’t being submitted to windows opened via javascript:window.open.

    What we found was all of the machines where cookies weren’t submitted were all either multi-core machines, or their CPU had hyper threading, and they all were running Windows XP.

    All of the machines that had cookies being submitted to new windows either were single core machines, had hyperthreading disabled, or weren’t running Windows XP.

    We verified this by turning off multiple-cores/hyper threading in the bad machines via the BIOS, and suddenly IE8 worked.

    Taking a working XP machine, and activating hyper-threading caused IE8 to start breaking.

    Turning off multiple CPU’s just to get a browser to work seems a little extreme and heavy handed, doesn’t it?

    I have a test page where this bug can be verified: http://www.plex.com/test/session_cookie_bugtest.asp

    A popup window will automatically open, showing the value of the HTTP Cookie server variable.  If that is blank, then no cookie was submitted, and the test is failed.

    If the second row of the table shows Test | 42, then the test is passed.

  35. Noman says:

    Hi I have been using the IE beta 2 with the hope that it will get alot better and for some time when i heard about the Release candidate i was very pleased but now that i have installed it, it has the same annoying bugs the beta version had.

    The "Session Store" that stores what you were browsing previously is very very buggy.. 8 out of 10 times it will open up tens of explorer windows when i knew that there were only two tabs open in the last session in one window.. Very annoying.. I am a Microsoft fan but the similar feature in Firefox is alot better..

    Another very annoying thing is that IE was and still is a memory Hog… Even when i have one window open with a few tabs it take 70 – 80 % of the CPU.. Bearing in mind i am running Vista 32-bit with 4GB of Ram and 2.4 GHZ Core2Duo processor..

    Some of the add-on (such as Delicious) dont work appropriately all the time..

    I am not sure if anyone responsible for the development/testing of IE is gona read this comment but if you do, please fix THESE issues as i love some of the new features, (add-ins, and Accelerators..) and would love to continue use it. But if you just release it out without fixing these issues, i am gona be completely of IE… Come one how long is it gona take you to come up with a better browser or at least be on the same level as the best out there..


  36. Bill says:

    I think I’ll stick with Chrome for now. Thanks anyway.

  37. There have been quite a few developer and technology releases in the past couple of weeks, so in case

  38. I really enjoy to became a beta tester for you, I working in IT environnement Bell Internet and we are a business partner with Microsoft and Msn

  39. Stephane Yelle says:

    I have the same problem that Gabriel & rikur reported, the Internet Explorer window appears [but not always] for less than a second and then closes, and the process ends by itself.

    Same with the -extoff shortcut.

  40. Lancey says:

    Yeah…great…cool…awesome…where’s the download link?

  41. Randy says:

    I had no trouble installing IE8 RC1 on two Vista PCs. However, I’m now encountering "Not Responding" on a fairly regular basis with the observation of multiple images of ieexplore.exe (4-5) running in Processes.

  42. Butz says:

    Sie sollten die Artikel zu IE8 auch in deutsch einstellen.

  43. Cool works much faster than IE7

    Just remember that if you install it and after installation apply Service pack , You will need to uninstall sp before you’ll be able to uninstall IE

  44. Sean J says:

    How do I Remove IE8 RC1 from XP SP3 if I dont even have the Add/Remove Button and yes I have admin right and the rest

  45. thuyle_tn@hotmail.com says:


    I can’t remove IE8 Release Candidate 1.

    Would you help me?