Windows Vista And Window 7:
1. Step number *ONE*:
Go into the start menu and click on control panel
2. Step number *TWO*:
Locate your Network and Sharing (may be named differently on a different OS)
3. Step number *THREE*:
Locate where you may manage/change your adapter settings
4. Step number *FOUR*:
Locate all "Local Area Connection #" or any networks which state "Microsoft Loopback Adapter" and disable them.
Window XP:
Start -> Control Panel -> Network Connections
Right click the one that says "Microsoft Loopback Adapter" as the adapter name and press "Disable".
Repeat to enable it.