There is Clockwise3D.. You could just re-install your copy of MSFT Win. Do you just need a copy of an correct explorer.exe? Cause if you are on Windows 2000, if its not illegal, I can just give you the explorer.exe file. Its up to you.
Other people may know more. I'm currently working on a pysch paper "Computer Crime, Corporate Paranoia, Revenge, and Justification."