Is a Belkin n-nimo, Matt, can's see why there is an issue. But you got the roouter's IP right at 192.168.2.1.
Boofhead. Wrapping foil around things ain't a good idea. You could, however, try moving the router around a bit as emf from electrics COULD interfere (although my router is on top of the actual PC so it shouldn't be an issue). Also, have you tried pointing the antennae in different directions as when they point "up" they ain't so keen on sending a signal "downwards"?
But something is weird. You get a new modem and TWO routers go bellyup. Is it just the internet that you don't get or is there no "local network"?
Only thing I can suggest at the moment is to "factory reset" the routers and start reconfiguring from scratch. Also, the manual
http://belkin.httpsvc.vitalstreamcdn..._v1_manual.pdf says you can use the setup CD with the other PC's to configure the network on other PC's but I can't see how that would help.
Sorry, without actually seeing it I can't do much more....