The Windows 7 Install disc does have a repair disc feature. And as I mentioned before I tried using that to repair the boot sector, but unfortunately it was apparently not a boot sector problem. I could be a problem with the hard disc, but it's not a problem with any usb device. The only usb device plugged in is the mouse and keyboard. Assuming for a moment that it's a problem with the hard drive, such as a fragment or bad sector, what would be the next best procedure? By the way I have no backups of my system so if I must re-install the os then I will have to pull the data directly off the drive before re-installing.