I have a problem with the system locking up, I have 3.6 Mhz processor, an 256MB Nvidea 6800 ultra videocard, 2 gig of ram, DirectX 9.0C

During a battle (the crash occurs 95% of the time during a battle) the game will lock up, usually when I am like 10-20 minutes in the game

very very VERY annoying...