Game Glitches

ok this is a reallly wierd glitch thats been happening to me when im playing stalker-Shadow of churnoble lol

The streched textures appear out of nowhere.. it happens everywhere in the game, to an unplayable level.. when dynamic lighting is turned on, and somtimes when it is off, but not as often.. happens in other games as well, like BF2.. doesnt happen in Supreme commander, or Americas Army, or not that ive noticed it.. im not too sure about FS10, as I havnt played it since my joystick gave out.. but just out of curosity im gonna take a looksee right now..
The streched textures appear out of nowhere.. it happens everywhere in the game, to an unplayable level.. when dynamic lighting is turned on, and somtimes when it is off, but not as often.. happens in other games as well, like BF2.. doesnt happen in Supreme commander, or Americas Army, or not that ive noticed it.. im not too sure about FS10, as I havnt played it since my joystick gave out.. but just out of curosity im gonna take a looksee right now..