Thanks for the reply Winner
Well in my video card properties the only tab that has that option is the Open-GL one, and its 'on by default'
Actually ive worked out what else it could be, I am getting a DIREXT X has expired error as i made the mistake of installing an unreleased beta of directx a couple of months ago i think it was

..anyway when for example i try to open winamp it brings up this tab , that i have to keep selectiing okay to; winamp eventually gets going and i can run AVS properly (well kinda properly)
so yeah im now looking around for a newer version of direct x. Once the official direct x 9.0 comes out im never going to again install those beta ones...
anyways cya