New Macbook pro, Want to default wireless g instead of n

Hello, Just a little background on my comp.

New macbook pro 17in., 2.5ghz cpu, 4gb ram, Running dual boot vista ultimate and mac osx

I primarily use vista for my working/playing, so here is my question. Is there some program or driver that I can load into vista to get my internal card to go off of wireless g instead of defaulting to wireless n?

Why g instead of n? Because in world of warcraft, the data packets/connection do not function properly while connected through wireless n, and I know wireless g is also provided where I am connecting. So that leads me to the question, is there a way to default the card to goto wireless g instead of n?

Thanks in advance.