Hyper-V KBs
Here's a quick jumpstart for you when you are in Hyper-V troubleshooting mode:
Description of the update for the release version of the Hyper-V technology for Windows Server 2008
(950050) - Describes the update to the release version of the Hyper-V technology for Windows Server 2008.
https://support.microsoft.com/kb/950050/en-us
(952627) - Describes the Windows Vista Service Pack 1 Management Tools update package for the release version of Hyper-V.
https://support.microsoft.com/kb/952627/en-us
(954279) - Discusses a problem in which you are not prompted for credentials after you receive an "Access Denied" error message when you try to connect to a virtual machine from the Windows Server 2008 Hyper-V MMC snap-in. Provides a resolution.
https://support.microsoft.com/kb/954279/en-us
(951308) - Discusses the increased functionality and virtual machine control in the Windows Server 2008 Failover Clustfer Management console for the Hyper-V role.
https://support.microsoft.com/kb/951308/en-us
Event ID: 5936 is recorded when you try to create a new cluster in Windows Server 2008
(947725) - Describes an issue that may occur when the CNO of a destroyed cluster is not successfully removed from Active Directory.
https://support.microsoft.com/kb/947725/en-us
When you try to enable, disable, or update Hyper-V technology, the process stops responding
(950792) - Describes a problem that occurs when you try to enable, disable, or update Hyper-V technology on a Windows Server 2008-based computer. The resolution is to rename the Cpqteam.dll file and then to try again.
https://support.microsoft.com/kb/950792/en-us
(949222) - Describes an issue in which a virtual machine cannot start. To resolve this issue, you must delete all virtual machines that have the beta version of Hyper-V. Then, re-create the virtual machines.
https://support.microsoft.com/kb/949222/en-us
The NLB host does not converge as expected on Windows Server 2008 Hyper-V virtual machines
(953828) - Fixes a problem that occurs when a Windows Server 2008 virtual machine is running in the Hyper-V environment on a Windows Server 2008 host computer.
https://support.microsoft.com/kb/953828/en-us
Guest operating systems that are supported on a Hyper-V virtual machine
(954958) - Describes the server and client guest operating systems that are supported on a Hyper-V virtual machine that is running on a Windows Server 2008-based computer.
https://support.microsoft.com/kb/954958/en-us
(954418) - Describes that sleep and hibernate power features are not available when you enable Hyper-V technology on a Windows Server 2008-based portable computer.
https://support.microsoft.com/kb/954418/en-us
Still having trouble? Don't forget to try the Hyper-V forum: https://forums.technet.microsoft.com/en-US/winserverhyperv/threads/