Hyper-V on Windows 10 Technical Preview Build 10049

Last night we released Windows 10 Technical Preview Build 10049 to Windows Insiders on the Fast ring.

This is an exciting release – as it has some key new technology in it.  Most notably it is the first release with Project Spartan in it.  You can read all about it here: http://blogs.windows.com/bloggingwindows/2015/03/30/windows-10-technical-preview-build-10049-now-available/

However, this build also includes a bug that affects Hyper-V. 

The bug stops us from being able to correctly register one of our system drivers if you choose to install Hyper-V.  It should be noted that if you already have Hyper-V enabled, and then upgrade to 10049 – everything works fine.  It is only if you install build 10049 and then enable Hyper-V that you will hit this issue.

If you want to use Project Spartan and Hyper-V on the same system – what you need to do is:

  1. Install an earlier version of Windows 10
  2. Enable Hyper-V
  3. Upgrade to 10049

If you are already on 10049 and have not yet enabled Hyper-V, you can either follow the above steps, or hang tight while we work on the next flight!