You could also refresh or renew your IP address.

1. Open the Command Prompt (from the Start button, go to Programs > Accessories > Command Prompt).
2. In the command prompt window, type ipconfig to see current ip address
3. In the command prompt window, type ipconfig /release
4. In the command prompt window, type ipconfig /renew
5. Exit the Command Prompt by typing exit

If that doesnt work you could call your ISP and ask for a change of IP address.