Thanks thomas for this!
Wntipcfg.exe is a GUI program that mircosoft are offering which
"The tool identifies your IP address, subnet mask, and default gateway for each of your network interfaces, including the interface for your network adapter, your dial-up networking interface, and your PPTP interface. It allows you to click a button to Release, Renew, Release all, or Renew all when configuring an IP address."
If you prefer this over ipconfig then you might find it worth a download.
Read more for instructions