Havn't been on the forums in a while, seems I didn't miss much though.
Anyway, that IP conflict normally happens when your DHCP sever on your rounter gives the same IP to two different computers/xboxs, or something like that. Just make your Computer and Xbox IP static instead of dynamic
Check out
http://portforward.com/networking/static-xp.htm.
Thats how to set up a static IP in Windows XP.
To do it on your xbox, well, you should know how.
In evox just go to settings change it from dynamic to static then punch in a IP adress (w/e you want like 192.168.1.200).
-dragonx