[Gatts]

Your VC (video card) looks fine enough (when I compare it with my notebook integrated video card)

Windows Vista is known for needing more system memory - how much of RAM do you have installed?

Try to deactivate any non-essentials programs : antivirus/ firewall, system backup, error reporting and search for any services that consume too much RAM and you don't need them (mostly windows programs that search the net for updates, check what you are doing and log it on HDD or send it via internet somewhere ... or check what you have connected etc.)