When I started, I was using the cable modem at our workshop but someone said "Limewire won't work." These machines are mostly running Windows XP, and so I used Bearshare and dealt with .rar files and something called ".7" -whatever, ((a .rar extractor.)) and of course, found nirvana in the simplicity of the 'torrent' scheme, --when it all worked. BUT, along came the Trojan., Then, only "Spyware Terminator" proved more successful than a big claw-hammer to fix that. BTW, it's free, and finds more partial bits and worms than any of these other Aps.

Your Networking panel and any connection doctor ('ping'ing) procedures should work as simply as mine do on this Mac. Their "Connection TEST" here reports OK?