If you enter
into your web browser's address bar instead of
does the Gamersgate site come up?
If Gamersgate loads for you using the IP number, you're having a DNS resolution issue.
Also, is it possible you have a firewall (or an antivirus suite that includes a firewall) that could be blocking the Gamersgate website?
One thing some web browsers have started doing by default is going to the https version of the address instead of the http version. This causes some websites to hang, since they have no https version of the homepage. Web browsers usually automatically change to the http version after a short time if there is no https version, but this doesn't always work.