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.