So this game used to work perfectly on my system... I'm not sure if it is the recent update or bugs in newer video drivers, but now after about 5 minutes of gameplay the game freezes for a second.. the HDD goes wild and then WAMMO.. black screen. I can still hear sound and the game is still running but I just can't see anything. My system is a core i7 running Windows 7 64bit with 8gigs RAM and 2gigs VRAM on a gForce GT 640M. Is anyone else having this issue or know how to fix it?