Release/Renew IP Address
Windows 98/ME
Click on Start -> Run
Enter winipcfg in the dialog box.
Select your network card (NOT PPP Adapter).
Click the Release All button.
Now click the Renew All button.
Windows 2000/XP
Click on Start -> Run
Enter command in the dialog box.
From the command line type ipconfig /release (with the space) and hit Enter.
Now type ipconfig /renew (with the space) and hit Enter.