It's unusual to see a new driver from a video card maker in the weekend but NVIDIA has just released its GeForce 180.84 beta driver, which features bug fixes and optimizations for Grand Theft Auto IV.  They have four editions of the new version 180.84 drivers, covering the 32 and 64-bit editions of both Windows XP and Windows Vista. NVIDIA recommends that you update to the GeForce 180.84 driver for the best experience on Grand Theft Auto IV. More details can be found here.