Trying to have Cisco VPN Client to work after upgrading to Windows 8 been an annoying headache to lots of people and now the same goes for Windows 10 :( .. Cisco VPN Installer never completes, aborting with the error: "error 27850 (Unable to manage networking component. Operating system corruption may be preventing installation)."
Like in previous versions of Windows, the registry key for the driver ends up with information in front of the name that prevents the VPN software from enabling the Virtual Adapter. This can be fixed by correcting the registry key:
Now you should be able to add your VPN Connection details and get connected. Hope this works with you.
Had some issues with an updated version of windows 10.. installed global VPN Client from http://help.mysonicwall.com/Applications/vpnclient/ and then CISCO VPN Client installed without any issues :)
Thanks to google and Eric M's post after God's Guide, here are the steps to get the Cisco VPN Client to work in Windows 10.
1 Ensure you are using the latest version of Cisco VPN Client
At the time, the most recent version and the one I used was 5.0.07.0440.
2 Pre-Install the DNE software
The issue seems to be with Cisco's installer not being able to make the required changes to fully add the DNE driver to the system. You can avoid that by having it pre-installed. You can get this from Citrix's site here:
About 1/2 way down, you will find the "Other DNE Problems" with links to 32-bit and 64-bit versions.
3 Install the Cisco VPN Client
Once the DNE is installed, the Cisco software should now work correctly... Install it now.
4 More issues: Reason 442: Failed to enable Virtual Adapter
Like in previous versions of Windows, the registry key for the driver ends up with information in front of the name that prevents the VPN software from enabling the Virtual Adapter. This can be fixed by correcting the registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CVirtA\DisplayName
It will be preceded by something like "@oemX.inf,%CVirtA_Desc%;" remove this so the line entry reads similar to "Cisco Systems VPN Adapter for 64-bit Windows" 
Had some issues with an updated version of windows 10.. installed global VPN Client from http://help.mysonicwall.com/Applications/vpnclient/ and then CISCO VPN Client installed without any issues :)
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