Lowering your graphic settings is a good idea to start off with. Your card seems fine to run the game.
What are your computer specs? Are you running dual core? If you're running dual core. You may need to shut one core down. The procedure is in the SWBF2 TweakGuide HERE
. There are also other CTD issues covered and the guide may refer you to the SWBF1 TweakGuide for some of them (because the engines are relatively the same).