(Copied from source)
- Right-click on the FortiClient icon on the taskbar and select Shutdown FortiClient.
- go to command prompt and enter: net stop fortishield [ENTER]
- RUN -> msconfig and go to services tab. Un-check the service FortiClient Service Scheduler and [APPLY] - Do not restart the PC now.
- RUN -> services and search for FortiClient Service Scheduler. Right-click -> Properties and change the startup type to: Manual.
Tested on Win 10 64-bit.