If you have the disk, you can back up the drive to c.d.s, all your files like pics, vids, files that you want to keep. Or use a flash drive. Then you can go ahead and go through setup, and re-install the o.s. Then once your done, you can save the backup files back to the h.d. IF you dont there are a few articals on http://support.microsoft.com search for "windows 2000 system restore"If you have any questions feel free to e-mail me on the e-mail address on my site. Let me know how it goes!Jon Ellender Sr. Tech.Texas Tech Servicesvisit us on the web @http://texastech.mycv.bz