no network drivers for XP using bootcamp 4.0 OS X Lion

I just installed Windows XP on my mid 2010 Macbook Pro. I have the Snow Leopard disks and installed the drivers from that. But I can't seem to get any network drivers so the wi-fi won't reach my laptop. I have boot camp 4.0.4 and no Lion disks because I downloaded Lion on the App store.

I realize I could get Windows 7 but W7 takes up too much space for my tiny little 128 gig hard drive.

Would it be possible to downgrade Boot Camp versions? Or is there nothing I can do?

Thanks for any responses.