Zelda Windwaker and Mario Galaxy Help please?

[Fahd]

I just had a thought, is it possible I'm having these problems because I am running a DirectX 11 Graphics card and Dolphin doesn't fully support it yet? (I'm using an ATi Radeon HD 5850 Black Edition), as Dolphin always uses a DX9 plugin, if so is it possible for me to change the cards compatibility easily? sorry for the constant replies I am pretty desperate to continue playing through Zelda and Mario, they just look so much better on Dolphin than Gamecube and Wii. Thanks again!