You can go to START>RUN and type cmd. At the command line type
ipconfig /release
Then hit ENTER. Next, type ipconfig /renew and you should get a new IP address from the router.
If you have a cable modem, you may want to also renew its IP address. First, go ahead and release the IP address on the PC, then shut the computer down. Next, unplug the cable modem for a couple of minutes, then plug it back in again. Once all of the modem lights are green, power up the PC again. It should automatically renew its IP at boot.
Note: If you have a router, you’ll want to unplug it, as well, then plug it back in AFTER you plug in the modem, but before you power up the PC. The router will need to supply the PC with a new IP address.
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