Wireless network found but unable to then connect!! Help!!

Hello

I've just bought a Broadcom 802.11g network adapter (card) for my girlfriends Toshiba laptop. I have installed the software as instructed and inserted the card. The wireless network search, returns my home network with a 2 out of 5 signal strengh (which doesn't seem to change no matter how close I go to the router).

When I click on connect, it asks for the network ID, which I input and then it says 'waiting for network' for a few minutes before then saying unable to conect.

I know the ID is correct as my PC works fine using the same method.

Can anyone offer any advice as to what may be wrong? I'm losing hair rapidly with frustration!!

Thanking you in advance.

Darren