No wireless

I have a Scientific Atlanta 2100 modem. I had a Linksys WRT54GS wireless G router. No problems for about the past 4 years. I was able to connect my laptop, iPad and iPhone. Saturday 5/18/13 I was no longer able to get a wireless connection. I've checked all the cords, reset the modem and router and still nothing. When I connect my laptop directly to the modem I can connect wired. Thinking it was the router, I went and bought a WD MyNet 600 router. Still the same thing. When I connect the router, it finds the wired and wireless connections, but says No Internet access on both. Again when I connect directly to the modem I can get a wired connection. I brought my laptop to a friend's and am able to connect to their wireless connection, so I don't think it's my adaptor. I disabled then uninstalled Avast Free and disabled Windows 7 firewall.

What else can I try? Anyone know how to check the modem settings to see if somehow that's blocking the wireless access?