All you really want to do is format your hard drive, and reinstall Windows.
If you've backed up all of your data, this shouldn't be a problem. As it happens, I just posted these instructions for another user:
http://support.dell.com/us/en/kb/document.asp?dn=1089352
This page is from Dell, yes, but it should work for a Compaq. The instructions for installing Windows change little from OEM to OEM.
alc6379
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Catweazle
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