Win10 in-place upgrade + Cisco VPN = No network
Windows 10 released early today and while we have been running 10 on a host of machines we have waited until now to start testing in-place upgrades. While 10 is clearly a huge improvement over 8.1 there is one big gotcha you should avoid during setup.
If you are happen to have the Cisco VPN installed on your machine you will need to make sure you uninstall it prior to running Windows 10 setup (of course I am talking about an in-place upgrade rather than a clean install). Should you not remove the VPN client prior to the update you will not be able to connect to any wireless network and your network interfaces folder will display as “empty”. You will not be able to uninstall the Cisco VPN once Windows 10 is installed as the uninstall will consistently fail. If you find yourself in this position, the easiest fix will probably be to do a recovery/reset. Be aware that a recovery will remove your ability to roll back to Windows 8.1 within the initial 30 days following install. If you go down this route you should ensure that you have completed a system backup prior to performing the recovery.