I have a Dell Dimension 4600. I recently reformatted the hard drive, and everything worked fine; however, the next morning the computer would not load Windows and simply said "Primary Drive 0 Not Found," and then, "Strike F1 to retry boot, F2 for setup utility." Because I thought that I had a virus, I reformatted the computer again. Once again, everything worked fine until the next morning. I got the same error again, but this time, when I loaded the windows setup cd, I got this message: "Setup did not find any hard disk drives installed on your computer...Setup cannot continue." Any help would be greatly appreciated.