2008 Server with Hyper-V role installed does not like Nehalem processors?
Apparently this problem is known since September… It's been announced by Intel. Processors affected are: AAK119 (Xeon 5500), AAM123 (Xeon 3500), AAO89 (Xeon 3400), AAJ121 (Core i7-900) and AAN87 (Core i7-800, Core i5)
“In an article outlining hidden strife in the processor world, Andreas Stiller has reported the scoop that Microsoft advised against the use of Intel Nehalem Xeon (Core i7/i5) processors under Windows Server 2008 R2, but was pressured by Intel to refrain from publishing this advisory. The issue concerns a bug causing spurious interrupts that locks up the Hypervisor of Server 2008. Though there is a hotfix, it is unattractive as it disables power savings and turbo boost states. (The original German-language version of the article is also available.)”
A supported hotfix is available from Microsoft KB. But, apparently this hotfix is only correcting the problem, which is real. Note that you should apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing.
Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.