What DES said. Change your DNS settings.
If this happens to you again....Go to MY NETWORK PLACES, right click and click on properties, right click on your cable connection, and click on properties, double click on INTERNET PROTOCOL (TCP/IP), Go to DNS, and uncheck "obtain DNS automatically", check "use the following DNS server", and in the box type in a public DNS server, like 4.2.2.1 and close all, reopen a new browser, and you should see results. This won't be as fast as Comcast, but it will work. Change it back when Comcast is over it's little problems. You can search for public DNS servers....use what works for you.
Thorns