Thanx guys, i'll try all that. no, i havent done anything to cause it happen...all i know is i was copying a file to someone elses disk which he brought some work on to edit on my pc and after hes gone the next day when i want to copy *my* files, i cant anymore. It can't be a virus since i have Norton Anti-virus2002, although a scan the next day, did pick up a .js virus.