I doubt he can be ressurected without his grave being there, but you could try. Another thing-when you installed the University expansion pack, it recommended backing up your old saved games. If you did this, and your eaten sim was still alive when you didn't have University, then you could re-install the sims 2, but without University, then delete the new saved game folder that it makes and replace it with your backup, then install university. The university expansion pack converts saved games to a different format. Your saved game folder is "my documents/EA games/the sims 2" (if you backed up your saved games, this is not the backup folder).