Texture problems are more often than not a problem with memory on your video card, though Im sure someone more technical than me will help you out. Only thing I can suggest at the mo' is making sure you have the most up to date driver for your graphics card installed and make sure that the Direct X installer off the game has been installed (9b or something). Can't suggest anything else fella, sorry!

To find out what card your packing (fnarr) go to Start on your desktop, click on settings and then control panel, once that fires up double click on System and the click the tab marked Hardware and then on the box in the middle of the panel marked Device Manager. Your graphics card will be listed under Display Adapters,click the little + sign next to it to find out what you have.