you have a linksys router ? which one ?
your ping was a 100 to who tho .. the only people that have over a 100 to me (i'm in canada) is people overseas .. think about the traffic flow , xbox to router wireless to pc and then back again wireless to the router to get on the net .. the WRT router with kaistation runs the kai engine so on the pc you only open the UI .. traffic flow becomes much simpler , xbox to router to internet .. if u just bought the router and its not a Linksys WRT take it back :]