I have 4 PC networked here (3 XP and 1 ME) last night they were working fine, today I've been on my PC running through the router as normal and all's been fine,
tonight my daughter tried her PC got no internet connection so we tried another no internet the only 1 that works is mine I've removed the router connected them all to the modem(cable) and none work swapped cables around but the only 1 that works is mine

another update...I'm on daughters PC connected thru' USB port on modem and all works ok..