Ok, here's the rundown.
Step 1. Browse to http://routerlogin.net/
Step 2. You should see a prompt to enter your username and password, enter "admin" without quotes as the username. If you've changed your default login password, use it here. If you have not, the default password will be listed on the body of your router under a label that says "Network Key (Password)".
Step 3. Once you're logged in, you should see two tabs towards the top left corner of your screen. Click the "Advanced" tab.
Step 4. Under the advanced tab, click the link labeled "Router Status".
Step 5. In the router status screen, click the button labeled "Connection Status". It should be located in a field on the right side of the screen labeled "Internet Port".
Step 6. When the connection status screen pops up, you'll see two buttons labeled "Release" and "Renew", Click the "Release" button and wait for the screen to finish changing.
Step 7. Now click the "Renew" button. This should reset your router's IP information. Once all the window activity has ceased, log out of your router and clear all your browser's data.
Step 8. Reboot your computer and the router at the same time, and then try browsing to the site. Your problem should be fixed at that point.