I normally run SL on my laptop. However, I tried to use a desktop recently and the desktop is Windows Vista -- With a graphics card of ( Intel(R) G33/G31 Express Chipset Family). For some reason, it allows me to bump my graphics up to Ultra on firestorm, it won't allow me to put it on advanced lighting model and add shadows. The area to click the box for it is all grey, I can't click it at all. Is this graphics card not supported for SL shadows? Im confused. Help please!