Hi Fred.
What are you using to 'clean' Windows? That's an error message I've not encountered before, and I suspect that you may be using an installed program to do the cleanup job rather than the built-in Windows utilities.
In any event, that message is simply telling you that your Windows installation is in a mess and that you may be well advised to format the system and install Windows and your programs again. It is not saying that you need to buy another copy of Windows, simply that you need to use your existing one to start off again fresh and clean.
Your Windows CD can be used as many times as you like to wipe the hard drive clean and install Windows on it. You'll find help with the procedure in the 'Tips and Tweaks' topic that your question was split from.
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Grandad
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since Mar 2004