A reboot and reinstallation are required to establish these security changes. Please use the instructions in this article to reinstall the client software again. Be sure to follow each step exactly; any deviation may cause the process to fail.
If this does not resolve the issue, in rare cases, TAP install problem can be related to Windows or hardware conflicts.
First, please try running your Windows Updates and make sure your system is completely current.
If this does not yield any change, please try the following to install the TAP driver directly from OpenVPN: