Installing an old version of the Cisco VPN Client on a newly released Windows is usually not working like it should.
I installed the client version 5.0.07.0440 on a Windows 8 Laptop and tried to connect.
Following was the error message:
VPN Client failed to enable virtual adapter
The resolution for the problem is to change the display name of the virtual network adapter in the registry:
– From a command prompt, open regedit.exe
– Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CVirtA
– Select DisplayName and remove the leading characters:
old: “@oem8.inf,%CVirtA_Desc%;Cisco Systems VPN Adapter for 64-bit Windows”
new: “Cisco Systems VPN Adapter for 64-bit Windows”
Now you can connect!