"STOP: 0x0000006B" Stop error message during startup on a computer that is running Windows 7 or Windows Server 2008 R2 http://support.microsoft.com/kb/981833#phrss
I've not run across this but thought some of you here might see this problem.
Unfortunately, as is oft the case, Microsoft does not give the real source of the problem, that is, what software or action caused the problem in the first place.