It is not possible to install Service Pack 1 into a Windows 2008 R2 VM. The installation fails with error
The VM was migrated from a PVC host with a c2v procedure.
C:\Windows\Logs\CBS\CBS.logyou can see an error similar to the following :
2013-08-18 01:39:09, Info CBS Failed to call GetDeploymentInformation on deployment: amd64_netrndis.inf_31bf3856ad364e35_6.1.7600.21444_none_246b463a787bd9ff [HRESULT = 0x800736b3 - ERROR_SXS_ASSEMBLY_NOT_FOUND]
The source server has KB2807986 installed.
KB2807986 is incompletely forwarded into containers.
Remove KB2807986 from the source node (server reboot is required)
Re-run the migration.
KB2807986 can then be installed back on the node and in the migrated VM.