My laptop has just acquired an interesting problem. It runs for about 2 hours at a time and then an error message pops up saying that the internal HDD can't be found. After rebooting it works for about 2 hours, and then the same message flashes on the screen. Is my hard drive about to go out? I have a Dell Inspiron 6000, XP sp 2, 60 gig HDD, 2ghz processor, and its about 2 years old.