hi,thanks for replying, she has windows xp, what is safe mode, so sorry, am thick with computers!!, we did another virus scan check today with latest norton and nothing identified. When again we went to turn it off, it took ages for the screen to shut down, it did eventually, then we booted it back up and it ran another check, that was fine too!!. Its just very sluggish. The only thing I can think of is to save all her files to disk and re set the whole computer back to default, as ? a virus in a file??