I've installed Windows 7 on a Toshiba A100-VA9 laptop (Core2Duo T5500 [64-bit capable], Intel 945 chipset, 4GB RAM, Nvidia GeForce Go 7600 256MB video). A little investigation shows Windows using 3GB and 1GB of RAM is being assigned to the video card in addition to its 256 MB of dedicated RAM. Any ideas here? Windows 7 64-bit runs fine, seems stable but I really want to use all my RAM. Previously I was running Vista 32-bit so I can't compare memory availability with Vista 64-bit.