yes, i'm doing same, first of all after installing GNS3 i did:
command: 'hdwwiz.exe' (as Administrator) - Add Hardware Wizard will open.
Install the hardware that I manually select from a list (Advanced) -> Network Adapters -> Microsoft -> Microsoft Loopback adapter. If there is no such choice Microsoft KM-TEST Loopback Adapter should be chosen and also:
Open 'Control Panel -> Network and Sharing center -> Change adapter settings'. There will be a new network adapter and it should have a name 'Ethernet 2' (or some other number if there are more ethernet devices on the computer). For the sake of recognizability, we suggest renaming the interface to 'Loopback' or some other apparent name.
Next, enable Internet Connection Sharing, select the network interface which is used to connect your computer to the network (WiFi or wired) and open Properties -> Sharing. Enable 'Allow other network users to connect through this computer's Internet connection' and select 'Loopback' as Home Network Connection
and i've got that
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MTCRE l MTCWE
!) Safe Mode is your friend;