Reinstall Windows XP, keeping nothing (no personal files or programs). See How to Repair Install Windows XP for help. Repair Windows XP, keeping personal files and programs. See How to Clean Install Windows Vista for help. Reinstall Windows Vista, keeping nothing (no personal files or programs). See How to Clean Install Windows 7 for help. Reinstall Windows 7, keeping nothing (no personal files or programs).

You need to know which Windows version you have to know which set of instructions you need to follow. See How to Clean Install Windows XP for help. Reinstall Windows XP, retaining no data or programs.

Repair Windows XP, retaining personal files and installed programs. See How to Clean Install Windows Vista for help. Reinstall Windows Vista, retaining no personal files or programs. Reinstall Windows 7, retaining no personal files or programs. You could also Clean Install Windows 8 if Reset Your PC doesn't work for some reason. See How to Refresh or Reset Your PC in Windows 8 for help. Use Reset Your PC to reinstall Windows 8, retaining no personal files, apps, or programs. Use Refresh Your PC to reinstall Windows 8, retaining personal files and Windows Store apps only. You could also clean install Windows if Reset This PC doesn't work. See How to Reset Your PC in Windows 11/10 for help. Use Reset This PC to reinstall Windows 11/10, with or without keeping your personal files intact. If you try the least destructive one and it doesn't work, you're left only with the more destructive option: If there's more than one option for a given version of Windows, the first is the least destructive option, followed by the more destructive one. Choose a repair method based on the version of Windows you have.

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