Last week I installed Windows 8 RTM x64 on my notebook. Everything worked fine except Cisco VPN Client. I always get the message “Reason 442: Failed to enable Virtual Adapter”:
So i tried several things. Reinstall, Configuring fixed IP address, restart several times the service and then realized that the search of the adapter runs into a timeout. Renaming the network connection doesn’t work so I found a corrupt entry in the registry at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CVirtA there you will find a value called DisplayName with the entry “@oem8.inf,%CVirtA_Desc%;Cisco Systems VPN Adapter for 64-bit Windows” which i changed to “Cisco Systems VPN Adapter for 64-bit Windows” after a restart I could successfully connect via Cisco VPN Client. The correct entry for x86 Systems is “Cisco Systems VPN Adapter”. I hope I can help you with that!