Visiontek ATI Radeon HD 2400 Pro AGP  

taka welcome to the forums.

With the motherboard you have (GA-K8NS) and the chipset on it (nforce 3), that your chances of getting the video card to work with Windows 7 are next to zero. The problem is that you need a working AGP driver so that the video card driver will install and/or work properly. There is only one thing wrong with that, Nvidia has not provided a working AGP driver (or any support of any kind) for the nforce 3 chipsets.

See this thread here,

ATI radeon HD 3650 not detected

for someone with the exact same problem.

Hi, Stormy13

Thanks! Your information is very useful.
Well, I wonder it's time to replace new motherboard for windows7....

Taka