On my old computer I had 360 live with no problems. I had only 1 ethernet cord and the cord to go from the router to the 360. Now on my new computer which is practically an exact duplicate of my old desktop it won't let me be on the net here and Live on 360 at the same time. I've called my cable who told me to call my router who told me I needed 2 ethernet cords AND the 360 cord. Xbox was annoyingly the same in fact both women sounded the same.
I have a Linksys WRT54G router and 1 ethernet cord.
1 place said I "must of had network sharing enabled so you wouldn't need the router".
HELP in any positive way!!