I get variations on this question often. I'll tell you what to try:
2. Click run
3. In the run box type cmd.exe and click OK
4. When the command prompt opens type the following: *Press 'enter' after each new line.
ipconfig /flushdns
ipconfig /release
ipconfig /renew
exit
5. Erase your cookies in whatever browser you are using.
Frequently you will be assigned a new IP address when this happens. Sometime you will, sometimes you will not. If you are on a fixed IP address, this method will not work. If this works for you, you may want to save the above commands into a batch file, and just run it when you need it.