How To Release and/or Renew IP Addresses on Windows XP | 2000 | NT
From Bradley Mitchell,
Your Guide to Wireless / Networking.
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Follow these steps to quickly release and/or renew the Internet Protocol (IP) address of a computer running Windows XP, Windows 2000, or Windows NT.
Difficulty: Easy
Time Required: seconds
Here's How:
1. Click the Start menu button on the Windows taskbar.
2. Click Run... on this menu.
3. If the computer is holding a current IP address, type 'cmd' (without the quotes) in the text box that appears. A command prompt window appears on the screen.
4. Type 'ipconfig' (without the quotes) to view the status of the computer's IP address(es).
5. If the computer is holding a current IP address, type 'ipconfig /release' to let go of the address.
6. Type 'ipconfig /renew' to obtain a new IP address (whether or not the computer is holding a current address).
Tips:
1. If it is not necessary to view the current IP addresses on a computer, simply type 'ipconfig /release' or 'ipconfig /renew' (without the quotes) in the text box that appears in Step 3.
2. To bring a computer back onto the network after moving it to a different location, or experiencing an unexpected outage, first release, then renew the IP address. Computers on DHCP networks often (but not always) re-establish network connectivity automatically.
What You Need:
* WinXP, Win2000, or WinNT
* IP network connectivity
http://compnetworking.about.com/cs/windowsnetworkin1/ht/renewipaddrwxp.htm
If none of the above fixes the problem, reset set the router to the mfg's default settings, should be a button on the back, possibly recessed, this will also reset the router log on and password to the mfg's default. Then set up the network again, generally you get a CD with the router for this.