tried this but still having the videocard unsupported error.
I do not know if you tried this, I used Driver Fusion to wipe my system of it's Video drivers and did not let Windows install any video card drivers. You go to the card's site and DL and install the latest drivers. I let Windows initially DL the drivers and everything was going good until I installed TF and tried to play and it kept telling me my card was not a Directx 10 compatible card. So I wiped out the video card drivers and went to my card site and installed the drivers and it worked. It may work and it may not? Hopefully you will get your card to work.
