The only thing I can think of now is that maybe there is a virus on the hard drive that is so virulent that it cannot be removed any other way than by a piece of software like killdisk. You can download a free copy from lsoft. it can wirpe the free spaces clean or clean the whole disk clean but you will have to reinstall again if you do that or maybe change the hard drive. I had to use it one time because the virus was so virulent it would not allow a reiinstall at all. It was a display adapter virus.