First of all, it's best if you keep SP2 (I'm assuming this is the upgrade you are talking about) and try to resolve whatever problems you are having. Look through this thread and see if there are any solutions you can try:
http://www.daniweb.com/techtalkforums/thread10031.html
If there are other specific questions/problems, let us know and perhaps we can help.
If you decide you really do wish to uninstall SP2, reboot into Safe Mode, go to Add/Remove Programs in your Control Panel, and remove it.
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Posting Maven
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since Jul 2004