I've just reinstalled The Elder Scrolls IV: Oblivion and I've found that whenever I try to select anything in the Load Game screen, the game suddenly crashes.
No patches or mods and my PC's good enough to run Oblivion, it just suddenly stops working.
Well, I guess we cannot tell you to reinstall...
Maybe your save games were corrupted when you reinstalled?
It doesn't corrupt the save files, it's just that it crashes when I even select the Load Game screen.