Intel® Xeon® Processor 5600 Series
Hotfix required for Microsoft* Hyper-V
Systems with an Intel® Xeon® Processor 5600 Series with Windows* Server 2008 will need to install the Microsoft* hotfix KB 981791 before installing Hyper-V.
The Intel® Xeon® Processor 5600 Series have a new caching feature that was not introduced until after Windows* Server 2008 SP2 which may cause BSOD on systems without the hotfix installed.
Refer to the link below to install the hotfix:
"STOP: 0x0000001a" error message on a computer that has an Intel Westmere processor together with the Hyper-V role installed on Windows Server 2008 or on Windows Server 2008 R2