Cisco VPN on Windows 8.1/10 – Reason 442: Failed to enable Virtual Adapter

Click Start and type Regedit in the Search field and hit enter.
Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CVirtA
Find the String Value called DisplayName
Right-click and select Modify from the context menu.
In Value data, remove @oemX.inf,%CVirtA_Desc%;. The Value data should only contain the Cisco Systems VPN Adapter for 64-bit Windows.
Click Ok.
Close Registry Editor.
Retry your Cisco VPN Client connection.