If the scanreg sugestions do not work, then:
-Restart the computer, press the Del key(or whatever key is specified on the 1st or 2nd screen at startup) to enter CMOS Setup, use the arrow keys to highlight Default, Standard, or Setup settings, press Enter, press Y at the warning(if it appears), make sure the floppy drive is configured to boot before the hard drive, highlight 'Save And Exit', press Enter, type Y at the warning, insert the Windows boot floppy disk, press Enter, select 'Start Windows Without CD-ROM Support', press Enter, at the A:\> prompt type dir c: and press Enter:
(1)If you do not see the contents of the hard drive, then it has a problem(defective, loose or defective cable, or disabled or bad IDE1 controller).
(2)If you see your hard drive's contents, then do the following:
-If your hard drive is using 3rd party overlay or compression software, make sure it's properly configured.
-Use an antivirus floppy to check the hard drive for a virus(see your antivirus program's instructions).
-Type scandisk c: at the A:\> prompt, and press Enter to fix any errors.
-If no good, then type C: at the A:\> prompt, press Enter, type fdisk /mbr at the C:\> prompt and press Enter to replace the master boot record.
-If still no good, then type sys c: at the A:\> prompt, and press Enter to replace the system files.
-If nothing works, then the memory may be bad.