✔ 最佳答案
Radeon 9550 is a re-branded and stripped version of Radeon 9700, which supports only DirectX 9.0B and shader model 1.0
Vista's requirement is DirectX9.0C and shader model 2.0
DX9.0B is a totally different stuff from DirectX9.0C, this is hardware limitation, nothing that u can do about it...
welcome to vista...