If you can find it here, it’s all Cisco VPN, and you get a 442 error.

Let me tell you about my situation. I originally solved it once and could connect it back to the company, but when I was promoted to Win 10 1709 yesterday, I saw a reminder that Cisco VPN was not safe, and then the VPN service was removed. Then the Cisco VPN was fixed in the control panel and 442 appeared when connected.
Post a link that might help you solve the problem:
1. https://supportforums.cisco.com/t5/vpn/reason-442-failed-to-enable-virtual-adapter-windows-7-64-bit/td-p/1782751
2. https://blog.csdn.net/gotomic/article/details/8113536
The third one is the original link to solve my problem, registry problem: Solved
Solution steps:
1. Open registry center (Win + R, enter regeidt);
2. Locate HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CVirtA in the registry, double-click “DisplayName” on the right, and delete all characters on the left side of “Cisco Systems VPN Adapter for 64-bit Windows”;

3. Open vpnGUi.exe;
Someone who wants to solve a problem.