The Windows Installer package:c:95a81ae6b7710d0be9e6ff093dafvs_setup.ms_ could not be opened



.NET Framework 3.5 SP1 installation fails with error :

Microsoft .NET Framework 3.5 SP1 Setup
The Windows Installer package:

c:\95a81ae6b7710d0be9e6ff093daf\vs_setup.ms_ could not be opened.

Choose Retry to try again. Choose Cancel for exit setup.
Retry Cancel

Microsoft .NET Framework 3.5 SP1 Setup
A problem has been encountered while loading the setup components. Cancelling setup.




- Enabled verbose logging in Registry and then tried the install of .NET 3.5 SP1

MSI (c) (4C:00) [18:26:56:964]: Note: 1: 2262 2: AdminProperties 3: -2147287038
MSI (c) (4C:00) [18:26:56:964]: Machine policy value 'DisableMsi' is 2
MSI (c) (4C:00) [18:26:56:964]: Machine policy value 'AlwaysInstallElevated' is 0
MSI (c) (4C:00) [18:26:56:964]: User policy value 'AlwaysInstallElevated' is 0
MSI (c) (4C:00) [18:26:56:964]: Product installation will be elevated because user is admin and product is being installed per-machine.
MSI (c) (4C:00) [18:26:56:964]: Rejecting product '{CE2CDD62-0124-36CA-84D3-9F4DCF5C5BD9}': Msi is completely disabled.
Info 1625. This installation is forbidden by system policy. Contact your system administrator.
MSI (c) (4C:00) [18:26:56:964]: Note: 1: 1708
MSI (c) (4C:00) [18:26:56:964]: Note: 1: 2729
MSI (c) (4C:00) [18:26:56:964]: Note: 1: 2729
MSI (c) (4C:00) [18:26:56:964]: Product: Microsoft .NET Framework 3.5 SP1 -- Installation failed.

- Found that while extracting files in a random folder in C drive it is trying to run vs_setup.ms_ instead of vs_setup.msi
- "_ " is replacing the .msi format
- Found that a Regkey "DisableMSI" was added to HKLM\Software\Policies\Microsoft\Windows\Installer
- Renamed that key and tried the install and then we were able to .NET Framework 3.5 got installed without any issues


Content by: Amit Sharma

Reviewed by: Soumitra Mondal

Comments (7)
  1. Rick Sheeley says:

    Also, uninstalling .NET 3.5  and then installing 3.5 sp1 will also get you past this.

  2. Bradley says:

    Can't uninstall … Same error when I try to uninstall it.

  3. rosen says:

    I tried this and helped!!

    Step 1: Use .Net Framework CleanUp Utility


    1. Please download the tool from the following link:…/

  4. Zenk says:

    Open your registry editor (Run > regedit).

    Go to:

    HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Control > FileSystem:

    – NtfsDisable8dot3NameCreation must be: 0

    – Win31FileSystem must be: 0

    (You can change it back, after installation.)

  5. Keshav says:

    I fixed this by adding the registry key (DWORD):


    with Value 1…/aa368353(v=vs.85).aspx

  6. Erik says:


    Same worked for me on a Terminal Server, Thanks!

  7. Mohamed says:

    Hello Keshav,

    That helped me! Thank you very much…

Comments are closed.

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