Microsoft Virtual PC is an application that has been reported as causing this issue
If you check in "Programs and Features" in "Control Panel", you may have this installed.
Since it has been related to causing the error code: 651, I suggest that if you 1, Have it installed 2. Don't require it. Then please uninstall it.
click here - see post(s) by "kimsland" (2 posts) to uninstall Virtual PC