Changing the network my xbox 360 connects to from my MSHOME network, to my windows vista WORKGROUP network?

I've had my 360 connected to live via ethernet to my router which connects it to the 3 windows XP computers in my house under the network MSHOME, which I never did quite learn to share files or anything else with except internet. Heres the problem, I bought a labtop with windows vista home premium on it... show more I've had my 360 connected to live via ethernet to my router which connects it to the 3 windows XP computers in my house under the network MSHOME, which I never did quite learn to share files or anything else with except internet.

Heres the problem, I bought a labtop with windows vista home premium on it which created the new network WORKGROUP I think. I switched on one my windows XP pc's to WORKGROUP from MSHOME and thanks to vista was able to transfer files like my music library between the old computer and my labtop. I opened windows media player 11 (preinstalled) and found out my 360 isnt on my new network, its on my old one apparently which is why windows media connect cant find it im guessing. I use a hard wired method using long Ethernet cables connected to a router in my living room and its worked fine for years. How do i change which network in my house my xbox 360 connects to? windows help didnt say anything about selecting a ~WIRED~ network, only help with wireless ones.
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