Usually within an hour of gameplay, it would crash. But what I noticed is that it would crash during the heat of battle or encountering an enemy. After searching around, I assumed it would either be a sound or graphics problem. So I decided to update my sound card drivers, but also I lowered my graphical and texture settings. During those battles, it would lag a bit...but not crash. So I'm assuming its a graphical problem.......thought this game was endorsed by ATI lol.