Well, if you're that far from the router, then there's your problem.
Cat5e is good for 300 feet. 100ft cable isn't that expensive either, if you know where to get it. ;)
http://www.monoprice.com/products/produ ... 1&format=2
I thought that longer the cable the worse the connection is but your connected...
I found this wall outlet thingy........Router to outlet, outlet to xbox, using 3 foot cable for both and it works. made by netgear.
You mean networking through your house's power grid? I didn't realize that stuff was available yet. I can't imagine it has the best ping times, which is the most important part of online gaming.