masonator
I am confused as to why you are having these problems because I am also using the
Netgear WGT 624 for around four years now without any such problems myself and I am running three computers from mine.
As your first port of call, you contact the Netgear helpline and get them to talk you through your set up. When I first brought mine, this out of the box and up & running in minutes talk is nonsense. My brother had a friend who was supposed to be a wireless set-up expert have a look at our set up but to be honest he was more of a waste of time. In the end we resolved the problem by reducing the encryption from 64 bits to 32, which I know is less secure but at the same time I had disabled the SSID so it is hidden and then allowed only logged mac addresses to access the network.
I suggest you keep calling the helpline until your problem is resolved.