Internet doesn't work!

On my old computer, after I tried to network my two computers, the internet doesn’t work anymore. I’ve checked just about everything there is concerning internet connection, and even ran the internet connection wizard, and folowed through all the steps. When I connected the cable from my modem to my computer, the computer shows that Local Area Connection is enabled, but I can’t network anything or I can’t even use the internet. I’ve turned off my firewall, and still nothing works.

HELP!

GBP