Error when playing game

[~NeonFire~]

I get this error when playing a game. If I click OK, it works for another few seconds and then appears again.

Access Violation

While processing data graphics data an exception occurred you may need to restart the emulator

I've restarted several times and it still appears. :dry:

[Mupen64 Man]

you might need to improve your graphics card.

[Jale]

Sounds like a video plugin related problem. Which one are you using?

[alexxi]

I've seen this before while playing on another computer, playing in Full Screen usually solves the problem.