Open the Add/Remove Programs control panel and select Uninstall Windows Millennium. If you can't uninstall Windows Me, you may have to perform a clean installation of your original OS using the CD from the version of Windows previous to the one you want to restore. For example, if you're performing a clean installation of Windows 98, you'll need a Windows 95 CD to prove that you're doing an upgrade, not a new installation.
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The RudeDawg
Known in these Forgotten Realms as Perin LightEyes