not installed bit locker and encryption isn't being done on the hd. It passed the smart check fine and the drive don't contain bad sectors either...tried reinstalling xp and ran that before for a month and twas working all nice to test things but didn't have the errors.

Strange enough, it only seems to happen on the folders that I actually own i.e. Downloads, Documents, My Pictures, My Music...those folders are the ones I seem to have the errors on...say if I save on a different location, everything seems to be ok..

It's really doing my head in it happened again this evening when I tried to save a 42Kb file on My Documents folder