A small office I support has had 4 out of 10 machines in the last week start BSOD'ing unable to load registry. Seems like too many to be a co-incidence. Anti-virus finds nothing, windows updates are current. 3 machines are Dells, 1 a Gateway, so can't isolate to single hardware. A new virus? Power surge? Lightening? Bad windows update applied? No glaring hardware erros in event viewer. Got me puzzled.
I have seen two machines the last week intermittently be unable to load the system hive. A chkdsk in safemode fixes the issue for a few days, but it returns. Tried in-place upgrading one of them as well, to no avail.