If your LW's connection to the network is ok (ie all green bars), & it's the files themselves that won't connect...you might be seeing fake files. These will sit connecting for ages & then get stuck at 'need more sources' forever. Is that what you see?

If it is, check out the threads below for more info & tips.
Fake files showing up in search results

How to find music (tips for movies as well)

There might be a firewall within your router. If you can tell us the model number of your Belkin, we can probably give you instructions for port forwarding. Or, have a look at the router list below. Find your router, choose LW from the list of programs & follow the instructions from there.
PortForward.com - Free Help Setting up Your Router or Firewall

Don't forget the step of setting up a static IP address, if that's in the instructions. LW's listening port, port in the 'manual port forward' box & port forwarded within the router all have to be the same number

You won't see a .limewire folder unless you've used much older versions of LW in the past, on your computer. The .limewire folder is the old location of the preferences folder. Please read point 3 here for the new location.
Fixes for LimeWire