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The loopback adaptor is created by npcap, the capture library used on Windows.

Earlier versions of npcap created this adaptor, the current (0.9983) doesn't need it, and the creation is controlled by a setup flag.

If you have npcap 0.9983, uninstall and reinstall and make sure you do NOT check the option for "Legacy loopback support".

If you have an earlier version, uninstall it and install 0.9983 (from the npcap site) and follow the instructions above. Note that uninstalling some earlier versions of npcap (0.994 & 0.995) could cause a crash.