So I decided I'd play Oblivion over again today. I wanted to remove a lot of the mods I had installed, so I just said I'd do a fresh install. So I uninstalled everything normally and then reinstalled it all. And Oblivion crashes on launch. So I uninstall everything and this time just installed Oblivion, no mods, no mod managers, etc. And it still crashes. I used to be able to play, so what could have changed?
Did you try cleaning the registry? I had a similar problem like this before... I used CCleaner to clean my registry. There is a link on how to properly uninstall and reinstall Oblivion, but I can't really give it since I'm on an Itouch...
Edit: ah, here it is.
Bben's reinstall procedure.
http://www.tesnexus.com/articles/article.php?id=240
Hope this helps..