So I got a laptop with windows 7, cleared the whole drive out, and installed Ubuntu 9.1 on it. Now I am selling the computer, but the person who wants the computer doesn't want Ubuntu they want Windows XP. So I have an extra copy of windows xp install disk, and I cleared out ubuntu, reformatted the hard drive to NTFS using a bootable drive formatting program. Then I inserted the windows xp disk, figuring it would be as always, a painless process. The disk goes into the blue screen, starts to load up the installer, but doesnt get to any point in which I can make any choices, it immediately goes to this blue screen: A Problem has been detected and windows has been shut down to prevent damage to your computer. If this is the first time you've seen this stop error screen, restart your computer. If this screen appears again, follow these steps: Check for viruses on your computer. Remove any newly installed hard drives or hard drive controllers. Check your hard drive to make sure it is properly configured and terminated. Run chkdsk /F to check for hard drive corruption, and then restart your computer. Technical Information: *** STOP 0x0000007B (0xF78DA63c, 0xc0000034, 0X00000000, 0x00000000) I went back to the partition bootable software and I tried to repair the MBR, but it said the drive does not have an MBR. I can reinstall Ubuntu if I want, but I cant install windows. What do I do to get windows xp on the computer?