hi i have two computers and a playstation3 that i am trying to put on the intrernet. right now i have one computer and playstation hooked up from computer to router and wirless to ps3. i would like to mabe get a wifi card for my desktop? or is there another cheap way to hook them up. two computers running XP/netgaer WNR3500 wireless-N gigabit router/PS3. help please