When moving a Virtual PC from my tablet to my desktop pc sometimes I get a blue screen stating that an error in the intelppm.sys and/or the processr.sys driver has occurred (usually when attemting to shutdown the virtual machine for the first time). 

If you are seeing this problem repeatedly you can manually disable the drivers that cause this problem (with no negative side effect) by going to the following location in the registry:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Processor

Or

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Intelppm

And changing the 'Start' value to '4'.

For more information on this problem refer to the following post from Ben Armstrong