How to Uninstall an Operating System on a New Computer

By Dean Lee

Use a Windows Installation Disc to uninstall a computer's operating system.
i computer keyboard and mouse image by Warren Millar from Fotolia.com

To uninstall an operating system, use a previous version of that operating system on the computer. For instance, if Windows 7 is installed, it can be uninstalled by installing Windows Vista or Windows XP on the computer. The Windows XP installation CD allows the user to delete the contents of a hard drive or partition that has an operating system on it without installing a new one.

Insert the Windows Installation Disc into the disc drive and restart the computer

Press any key to boot from the disc.

Start the setup. In Windows XP, press "Enter," then the F8 key to accept the user agreement. In Windows Vista, select a language, then click "Next." Click "Install Now," then enter the product key. Check the box to accept the user agreement, then click "Next."

Delete the current operating system. In Windows XP, select the drive, then press "D" to delete it. Press "L" to confirm the deletion. In Vista, click "Drive Options," then select the drive with the operating system and press "Delete." At this point, the user can choose to continue installation and downgrade to XP or Vista. The previous operating system is deleted.

Items you will need

  • Windows Installation Disc

  • Computer

Tips

Uninstalling an operating system will remove any files or settings from that system. It is recommended that any data on the operating system to be uninstalled be backed up using a network location or removable media, such as a CD or DVD.

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