It happened earlier today again - so it's NOT the backup software, as it only runs at night. I do have MBAM, Opera, and The Bat! (email client) running. Had to restart. I uninstalled Avast - because the next problem may be much more serious - that's how many of my week-long recoveries started - by resets, etc. I'll let you know if it happens now that it's uninstalled (and the registry has been cleaned of it's residue).