Hello! I have the EXACT same problem as the fellow above and I'm not really clear on how he solved it. I can see a very strong wireless signal from the home network I am trying to connect to, but it just tells me that I am "unable to connect". With help I was able to download some network setups for my wireless network at school and connect there, so I know the wireless works, but just not at home.
Acer Aspire 1830T, Windows 7 Home 64bit, the network is WEP, radio type: 802.11g, Motorolla modem plugged into an airport extreme