Here are several options for changing your ip address, depending on your configuration:
1] Always delete your browser cookies before trying the following suggestions
2] If you're using dialup, simply using a different dialup access number will almost always change your ip
3] If you need to do this ip changing thing often, you can make the whole process simpler by using an ip changer service like iprivacytools.com to change your ip address.
4] For those using cable/dsl (no router), go to your START menu, type "cmd" and hit enter. At the command prompt, type "ipconfig /release" and hit enter. Then type "ipconfig /renew" and hit enter.
5] If #4 didn't work and you're using cable/dsl (no router), then try this: go to your START menu, type "cmd" and hit enter. At the command prompt type "ipconfig /release" and hit enter. Then right-click on your "local area connection" and click "properties". Double click on "Internet Protocol tcp/ip". Click "use the following ip address" and enter 188.8.131.52 for the ip and 255.0.0.0 for the subnet mask. Click OK, and then OK again (close the dialog box). Wait a few seconds, then go back into that dialog box and instead of "use the following ip address" click on "obtain an ip address automatically".
6] If you're using cable/dsl with a router, login to your router's control panel and change (clone) your mac address by increasing or decreasing the last digit by 1. Then disconnect and reconnect using the router control panel interface. Usually you'll get a new ip address.
7] If none of the above worked, go to your START menu, type "cmd" and hit enter. Then type "ipconfig /release". If you're using a router, log into your router control panel and release the ip. Then turn of your computer, modem, and router for severals hours (e.g. overnight)
8] If nothing has worked, contact your isp and tell them you're having some problems with your current ip address and want a new one. They should be able to give specific steps to get a new ip.
I hope this has helped. If you have any questions, please let me know.