Win 7 networking, switches and routers

I set up a 4 node network in our office. No problems, the 4 pc's were hardwired into an 8 port switch. We recently took possession of an office suite next to us, and we need to move a couple computers there. We ran fast cat5 next door, from the Linksys ezxs88w switch to a 4 port linksys WRT310N wire less router. The computer is hardwired into the router and has access to the internet. The...