Do you have the 2003 disk? Maybe you could put it in instead. You must have deletes the install files when you installed 2000, it pops that up at the end to "save some disk space". Otherwise, boot in safe mode and delete everything office, then reinstall 2003.
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If your equation requires either a complex combination of variables to get the desired result OR you can't seem to get the result regardless of the variables....it ain't your variables, it's your constant.