Required Hotfix For Windows 8 VM Running on Hyper-V 2008 or 2008 R2 Host

EDIT 8-2-2013:  A new update KB 2744129 has superseded the  original KB 2526776

Please note that this new update now applies to Hyper-V 2008 and 2008 R2  -- the original was only for R2.

If you are testing out Windows 8 as a VM which is hosted on a Windows 2008 or 2008 R2 Hyper-V server, then you will need to install the following update.

An update that enables the Windows Developer Preview or Windows Server Developer Preview to be hosted in a Hyper-V virtual machine on Windows Server 2008 R2

You cannot run a Windows 8-based or Windows Server 2012-based virtual machine in Windows Server 2008 or in Windows Server 2008 R2

The issue occurs because the Hypervisor does not handle the one-shot synthetic timer that is also known as an aperiodic timer correctly.

Note that this will require a reboot of the host machine, and if you do not install the patch the host may produce a stop screen, and restart which will impact other running VMs on the host.

Cheers,

Rhoderick