to identify the key you need, you can search the registry at the key given in my script above. There you find some Subkeys ("0000", "0001" and so on), one for any possible Networkconnection.
There is a Value "DriverDesc" wich identifies the Device Driver in plain text (e.g. Intel(R) PRO/100 VE Network Connection or something like that).
In the same Subkey, look for the Value "NetcfgInstanceId" wich will give the GUID you search.
my script above just lists all available adapters and their GUIDs.
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german native-> poor english
sysadmin-> poor german...
