Video card problems causing games to crash

Whenever I try to various video games on my macbook, they always crash before any graphics come up at all. So I am assuming that this is a graphics card issue. Forgive me if I'm wrong though. The crashes involve me double clicking on the icon to start the application. Then I see the taskbar up top showing that it is going to start the app and then I get this image



When I first got my mac, I installed diablo 2 on it. Had to jump thru some hoops and installed some 3rd app which allowed me to run the game smoothly. I uninstalled the game. But recently reinstalled it and i got this message instead of the usual messed up looking graphics that most people get.

I'm pretty sure Diablo II doesn't require much more graphically than the GUI of OS X does, so my guess would be try reinstalling the game and trashing the preference file (diablo wtfever .plist - just spotlight diablo plist). Try again. If no luck, come back here. No one else had replied though, os I figured I'd try to help ya out.

Also, what class do you play? I used to have a level 92 charged boltress XD. Soooo much charged bolt coming out of me and killing cows haha