I have a US Robotics ADSL Gateway installed on my PC.
I have been able to connect a HP laptop to this Network.
I cannot connect my Sony Vaio TR5 to this network using the inbuilt wifi.

I can connect the Vaio to the wireless network if I use a network card so I know the Gateway is working ok.

With the built in wifi on the Vaio the green light is on, it does not flash but I am not sure with this model if it should. I can "see" the gateway (URS9106) but cannot connect to it. I cannot access the PC or internet etc from the Vaio, it continuously says that the wireless network is unavailable.

Have anyone had any experience connecting to a wireless network using a Vaio and its built in wifi? Are there any known compatibility issues?

I am not too sure what to try next as all the settings appear to be correct.

I would appreciate any help you can offer. I have rung Sony and they say to ring US Robotics and US Robotics say to ring Sony!!
Thank you.