UPDATE I cannot believe it! I bought Fallout:New Vegas on Steam sales and SAME problem! Question remains open, because I would prefer playing it in Windows 7 in the future, if possible. Bounty points have been assigned to Oak, that suggested to install Windows XP in dual boot.
Updated drivers to latest 10.10 from ATI/AMD.UPDATE: I tried also the following things but STILL no result My config: AMD X3 720 - XFX ATI HD 4770 - 4 GB RAM - Windows 7 32-bit Re-downloaded the whole game content two times(!).No other messages than the generic Windows 'Application stops working' dialog. Fallout 3 GOTY crashes as soon as I try to create a New game, while Fallout : New Vegas crashes immediately after first video.
I have a problem with Fallout 3 GOTY and with Fallout : New Vegas, both Steam version.