Re: g-force 6200 works fine but won't play video!
i have the same card on the intel platform and i also used to have the same problem. i think you are using 77.xx or 78.xx forceware drivers. try upgrading it to 84.21(which is the one i use now) and you won't have problems.
i don't remember upgrading my chipset drivers but if the others recommend it, try it too. maybe some motherboards come with older drivers.