Hyper-V virtual machines unable to start after upgrading to 2008 r2 Enterprise

I recently upgrade windows server 2008 r2 standard to r2 enterprise (hyper-v role). The upgrade went smooth after I unistalled sp1.

After upgrading, I attempted to start the virtual machines and failed. I received error unable to initialize virtual machine.

Please advise on how to get the virtual machines back up. I am currently running updates...
I am assuming when I uninstalled sp1, it uninstalled hyper-v role?

please help..
Who is Participating?
cpatelxConnect With a Mentor Author Commented:
I had to reinstall SP1 once upgrade to R2 Enterprise was complete (ran windows update). Once, updated I am was able to start up the virtual machines.
Imtiaz HashamTechnical Director / IT ConsultantCommented:
Can you tell me what the event viewer says please?
Did you check the permission on the volume which host your VHD files to make sure they did not change post upgrade
cpatelxAuthor Commented:
Ran windows update
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