First of all, forgive my noobishness as this is the first time I own a computer and I do not know too much and after much confusion I decided I could use help from this community. So I use an ATI Radeon HD 7850 Gigabyte and I tried to install physx but I don't think it worked. http://www.nvidia.com/object/physx-9.12.0613-driver.html This is the link I downloaded from and all I did was say install. The reason I'm trying to get physx is because I am trying to play a game called Metro 2033 and in there physx is enabled and I was told I needed it to play the game as the game always just keeps freezing and turning black and when I ctrl+alt+delete and click on start task manager, on the desktop on the bottom right I get the message "driver has stopped working". no matter what I did the game only plays for about 3-4 minutes but then starts to become problematic like this. If someone could guide me and help me I would be grateful! Thank you!