Originally Posted by plastics1man
Could Microsoft had done something remotely to my PC?
lol, nope! how odd! Possible nasty, the kb915597 is a definition update. Or it could be a third party app after all, so if it does happen again (hopefully not), disabling them one at a time may be a better idea in identifying which one. At least you won't have to re-install. Will mark this one as fixed.
