Windows - Computer connected directly to the modem

1. Get to a command prompt. (START, run, cmd).
   
2. Type "ipconfig /release" (without the quotes, on the command line by itself).
3. Type "ipconfig /renew" (without the quotes, on the command line by itself).

Windows (second option) - Computer connected directly to the modem

1. Get to a command prompt. (START, run, cmd).
2. Type "ipconfig /release" (without the quotes).
3. Shut down computer.
4. Turn off computer.
5. Turn off all ethernet hubs/switches.
6. Turn off cable/DSL modem.
7. Leave off overnight.
8. Turn everything back on.