haha! more than one network.... weird....
well i know one way of fixing it....
you tell your router to broadcast the signal... i think its like what Drac mentioned... where you could set it with no scurity for a bit to get it running, then apply your security afterwards... i dont think its really that risky, unless someone on your street is a professional hacker and is waiting for the exact moment you let your guard down....
EDIT: you see before my uncle re-did our internet, our router was broadcasting, and my ibook picked up and connected to the internet automatically... so i dont see why you couldnt do that... then you could always apply the security afterwards...