How can I prevent a user from running or stopping a scheduled process?

Start Group Policy Editor (GPE) for the container you want to modify.

Expand either User Configuration or Computer Configuration.

Expand Administrative Templates, Windows Components, Task Scheduler.

Double-click "Prevent Task Run or End."

Select Enabled and click OK.

Start regedit.exe on the machine where you want to block access.

Go to HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindowsTask Scheduler5.0 or HKEY_CURRENT_USERSoftwarePoliciesMicrosoftWindowsTask Scheduler5.0 (you might need to create the key).

From the Edit menu, select New, DWORD Value, enter a name of Execution, and press Enter.

Double-click the new value, and set it to 1. Click OK.

Close regedit.