I initially had troubles starting it up at all, but once I run it through my AMD control panel it starts up, but then after in game for 30 seconds or so it gets real slow real fast and eventually just appears frozen. I am presuming it is a frame rate/resolution problem but can't seem to find anyone else with the same issue. Anyone got any ideas?

I have Windows 7 64bit and AMD Radeon HD 7800 Series.