If you have OBMM then it has a conflict detector, or if not, you can try http://www.tesnexus.com/downloads/file.php?id=2579 I mainly use the conflict detector and a lot of trial and error.
Thanks again. It seems I have a larger problem now: When I try to start Oblivion, it simply doesn't start. Not even like the CTD that I was having before. It just does nothing. When using OBSE/OBMM to start up, the initial black box comes up, stays a little longer than usual, then closes. Nothing after that. I just installed Oscuro's Oblivion Overhaul before it happened. Is there any way to fix *this* problem?
Update: Actually, I just tried starting up using the regular start-up. It seemed to do nothing for a very long time, and then the "No Disc Inserted" message came up, but the disk is inserted.