Install LoopBack Adapater for Windows 7 is different with XP and Vista. Cause you cant find it in Add Device.
1. Click Start then type “hdwwiz.exe“. This should launch the “Add Hardware Wizard“. Click Next.
2. Select “Install the hardware that I manually select from a list (Advanced)” and click Next.
3. Now from the list select Network Adapters and click Next.
4. Under Manufacturers, select Microsoft and select “Microsoft Loopback Adapter” under Network Adapter and click Next. Click Finish when the installation completes.