Got 3 PCs, 2 wired into the switch and one wireless. I hard to turn off the built in windows firewall on all the computers so they could "see" each other(ping and use windows file sharing). That all works fine now but I want to turn the windows firewall back on. Is having the firewall in the router and the firewall turned on, on the PCs pointless? If not are there some settings on the Windows XP firewall I can set so I can still do file sharing? Dont really understand why introducing the wrt54g causes the PCs to stop seeing each other when it worked fine with a BEFSR41?