win7 install process with active internet connection and even windows update should have found the correct driver and did full install without needing a CD..
it's possible that this chipset is not compatible with win7 aero interface and therefore preventing install or normal functioning...
if the above driver does not work then your looking at either a incompatible chipset or even a bad chipset (defective)..
try and perform a complete full install of win7 including deleting and re-formatting of HDD.
this time with active internet connection select win7 to download updates during install process.