Updating your Drivers Guide.
Also my best guess is just system failure in one aspect of your computer. Weather its RAM/CPU/GPU I can't tell you. (Maybe you over worked your video card in the MMO and caused permanent damage) but its definitely not something we can fix. I think we can rule out HDD malfunction since GunZ data is not streamed, it's preloaded to RAM.
@Nagi, he has a 300GB HDD and a 12GB Partition created by his OEM for restore purposes. It makes it easier because then they do not have to create recovery disks for people.
