I’ve recently got a windows 7 64bit laptop and I decided to install in it my favorite game of all times: The Elder Scrolls IV Oblivion. After completing the installation and copying a bunch of mods from my older installation (in a Windows 7 32Bits laptop) I tried to start the game and every single time I tried to run it crashed to the desktop (CTD) with the message that the process oblivion.exe had stopped working. After a bunch of attempts to get the game running, including compatibility mode, updating the drivers of the graphic card and others, I found a solution that worked.
The only way to solve this was to delete everything inside the folder documents/my games/oblivion The only thing I didn’t deleted was the game saves. After that the game started working.
So here is my advice for those with a similar problem, just delete the files that are inside that folder and you’ll be fine.