Request a new IP address from your ISP server.
Here’s how to do it in windows:
1. Click Start
2. Click run
3. In the run box type cmd.exe and click OK
4. When the command prompt opens type the following. ENTER after each new line.
ipconfig /flushdns
ipconfig /release
ipconfig /renew
exit

this will NOT get you a new IP address from your ISP, only from your local dhcp server. In other words, this will only get you a new IP address from your local (home) router!