1) you'll need a full backup of the C:\drive just in case.
2) i would perform the Upgrade of Win2000, not a complete re-install-from scratch, because then you are sure to need a compete re-registration
3) it may be that you need to upgrade the adsksys.dll also. You can find it, so it seems,at
http://usa.autodesk.com/getdoc/id=DL154103