Could have been a couple of things....
Your "too many wireless signals" thought is one distinct possibility because it depends on what the spec of the tv-tv device was. It could be that it was simply swamping the wireless PC stuff either with a greater signal strength or simply the volume of data it was sending on the available channels.
Another is hinted at in Mike's first post where he says the 192.168.0.1 address needs to be ste. You might have had two pieces of equipment with the same address set. Bound to lead to confused PCs that!
Anyway, nice to see you've got a result. Shame about the telly though ...
ST