Video card driver problem after installing windows 7 w/bootcamp

I installed windows 7 on my new macbook using bootcamp. The only reason i wanted windows is to play videogames. But after having installed it i experienced problems with the video card driver (When i try to install a game a pop up message comes up saying:" hardware acceleration is either disabled or not supported by your video card driver, which could slow game performance. make sure you have the latest video card installed and that hardware acceleration is turned on")

I have followed each step the manual instructed me, and i also uninstalled windows 7 and installed it again twice. i also ran the setup inserting the MAC OS X LEOPARD DVD.it still doesn't work.

thanks for any usefull tip!

p.s. also it doesn't connect to any wireless (it says no wireless networks were found, but i'm sure 20 or more wirelless networks can be found just in my building!)