Cisco VPN Client Not Working With Windows 8.1

Symptom
Error 442 - Failed to Enable Virtual Adapter, when starting on Windows 8.1

1. Go to HLKM\System\CurrentControlSet\Services\CVirtA
2. Verify that the DisplayName reads "Cisco Systems VPN Adapter" or "Cisco Systems VPN Adapter for 64-bit Windows". If it doesn't, change it.

Some of you may already have the proper name, if that's the case you'll need to perform these additional steps:

1. Navigate to the Cisco folder in Program Files and set Windows 7 compatibility for cvpnd.exe and vpngui.exe.
2. Make sure that the Cisco VPN Adapter in Network Connections is disabled.
3. Reboot
4. Launch the Cisco VPN Client

(Thanks to Teknarus for the second half)