video card problem

Hello

yesterday I bought my first apple (IMac).
everything is OK but after I installed the vista ultimate, I couldn't find the video card. it says that the video card is the Standard VGA Graphics Adapter the is manufactured by Microsoft!!!!!!!!!

please help

Thanks

how are you running Vista?
boot camp or with VMware / pharrells?
With boot camp it might just be the case that you need to install the drivers, which can be found here (those are for the 32bit edition of vista) 64bit can be found here

If your using VMware of similar, then it won't come up, it doesn't have primary function over the graphics card.

Thanks for the reply
I used boot camp to install vista.
I tried to install the drivers but it didn't work. so any other suggestions?