I have a D620 laptop that won't connect wirelessly to the internet. Im using xp and trying to connect through WZC, it connected before for about 30 seconds then went off, now I just get no networks in range. The wifi switch is on. I phoned Sky Broadband and they've done there checks, they say if 1 laptop can connect, the other one should. I own another Dell laptop which I've had no problems with. Anyone help?