This procedure is used when otherwise the VM would boot into a bluescreen type 7B.
This assumes that VMware is the target and you configure the VM with VirtualHardware type 7.
It only applies if the virtual disk is configured like this
scsi0.virtualDev = "lsisas1068"
scsi0:0.fileName = "imported.vmdk"
On the target platform boot the newly created VM into the Windows 7 Recovery CD.
After boot is finished click on the CMD-button and run regedit.
Select HKLM and then Menu > File > Load Hive.
Browse to the Windows-directory on the virtualdisk > system32\config and select the file SYSTEM.
When asked for a name enter p2v.
Then find the key
and set the start type to REG_DWORD 0
Then select HKLM\p2v and click Menu > File > Unload Hive.
You can close regedit now and restart.
On next boot you can start into the 2008 R2 system. It should find drivers and probably needs a reboot when done.