This is a recent problem.Sometimes PC will not close down at all, and now won't do a Hibernate or Standby mode.Just stays on. I must confess that this is all part of problems with AVG Tuneup. When installed it seemd VERY keen to put EVERYTHING to sleep -Firefox would not open, Photosync.remained dead.Have had 2 sessions with AVG support lasting about an hour each (!) while they got my PC back to "normal", but still the shut-down problem. I dread having to go back to AVG yet again.Anyone else had AVG tune up problems and regret buying it? Can anyone hlp me on this? I am hanging on to XP for as long as possible!