Microsoft details a workaround for virtual machine bug in Windows 10 build 10049

Windows 10 build 10049 was released just yesterday, but it was recommended that those running virtual machines hold off on updating due to a bug with virtualization software Hyper-V. Microsoft went into more detail on exactly what the bug is, and how to work around it in a blog post today:

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:

  • Install an earlier version of Windows 10
  • Enable Hyper-V
  • Upgrade to 10049

Alternatively, as noted yesterday, those using virtual machines in the Windows 10 Technical Preview can move to the slow ring and wait for a build with a fix for the Hyper-V bug to roll out there.

Source: Microsoft