I know there's a way of tying your network connections to intranet or internet in windows but it's been so long since I've messed with networking that was notworking that I've forgotten exactly what was involved. Try setting up a work group and connecting to that via the wired NIC and using the wireless for internet. I wish I could be more in depth but it's literally been a decade or so since I've been elbows deep in that side of it.
Phenom II 940 Black Edition quad core @ 3.5Ghz
2x1 gig OCZ PC26400 Platinum, 2x1gig GSkill PC26400
Some other stuff,
Even more stuff,
If the automobile had followed the same development cycle as the computer, a Rolls-Royce would today cost $100, get a million miles per gallon, and explode once a year, killing everyone inside. --Robert X. Cringely, InfoWorld magazine