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depends, do you have internet? if so, how is it setup? DSL/cable, you will need to have a router so both a pc and the xbox can connect to the internet at the same time.
Yes all or the above. I have X box live so what else do i need?
All the information is at http://www.xbchelp.com.
ive had trouble w/ a router.. ive had simpler luck w/ a hub... to each his own.
What stuff do I need for XBox Connect?