FIX #5: Special Case for Windows: End "Cptservice" and Retry Zoom Screen Share
There is a special solution for the screen sharing issues in Windows. If updating, reinstalling or modifying screen share settings doesn't solve the issue, try this fix. Thanks to the Zoom Community post for this solution.
1) When Zoom is giving you screen sharing failed error, open the Task Manager.
2) In the Task Manager, go to Details, locate the process named "Cptservice". End this process by selecting it, pressing delete button OR clicking on "End task" button in the bottom right.
3) Now open Zoom and try sharing screen. This will restart the "Cptservice" process as well.
4) Doing the above steps has fixed the screen sharing error in Windows for many users, in older versions of Zoom.