both my computers are using windows xp home and are connected to a linksys 802.11g 54mbps router without connecting to the internet. when i transfer one file from pc A wirelessly thru the router to pc B which is connected via ethernet, the speed is only around 20mbps using windows network file sharing. pc A supports 54mbps with a perfect connection and pc B's network card supports 100mbps so why is it so slow? is there a way to tweak the speed?