If you are using System Center Virtual Machine Manager (SCVMM) to manage your Hyper-V hosts you should download and install KB956589 on your Hyper-V hosts.  This update resolves several issues to improve reliability when using SCVMM to manage you Hyper-V hosts.


Link To The Update:  Hyper-V Update for Windows Server 2008 x64 Edition (KB956589)


Taylor Brown
Hyper-V Integration Test Lead