After installing Cisco VPN client on a machine running Windows 8, you may encounter an error when attempting to connect:
"Secure VPN Connection Terminated Locally by the Client. Reason 442: Failed to Enable Virtual Adapter."
For Windows 8 32-bit machines:
1. From a Run prompt, type regedit
2. Browse to the Registry Key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CVirtA
3. Double click DisplayName
4. Change the value data from "@oem8.inf,%CVirtA_Desc%;Cisco Systems VPN Adapter" to "Cisco Systems VPN Adapter".
5. Click OK
6. Close Regedit
For Windows 8 64-bit machines:
1. From a Run prompt, type regedit
2. Browse to the Registry Key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CVirtA
3. Double click DisplayName
4. Change the value data from "@oem8.inf,%CVirtA_Desc%;Cisco Systems VPN Adapter for 64-bit Windows" to "Cisco Systems VPN Adapter for 64-bit Windows".
5. Click OK
6. Close Regedit
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solution credit: http://www.firewall.cx/cisco-technical-knowledgebase/cisco-services-tech/942-cisco-vpn-client-windows8-fix.html