Been there done that several times. I had problem that I didn't know about till the computer finally just gave up the ghost and died. The bad thing I found out later that really pissed me off was all the back up CD's that I made using that computer are completely unreadable on any other computer! Some screwy was going on I guess in the file system. The disk would read in the computer as long as it was working but not on any other computer or at best every came out corrupted. The bad thing about all this more that really hurt was that I lost all the old BatLab stuff and I really really missed some those and some other of the old props and stuff that are no longer available. Now I back up on an external hard drive, then to a DVD as well as a CD just so I can make sure that I have at least one good copy of my files