The Task Scheduler starts when Windows starts. Unless you prevent it, users can change and/or delete a task.
To prevent a user from changing a Scheduled Task:1. Start the Scheduled Tasks utility.
2. Right click the task that you don't want changed and press Properties.
3. Select the Security tab.
4. Press the Advanced button.
5. Press the Add button.
6. Select the user or group you wish to prevent and press OK.
7. Deny the user or group Read Permissions and Change Permissions.
8. Press OK, Apply, Yes, and OK.
To prevent a user from deleting, or creating, a task:01. Open the Active Directory Users and Computers snap-in.
02. Right-click the domain or organizational unit where you want to create the Group Policy Object (GPO) and press Properties.
03. Select the Group Policy tab and press New.
04. Type a name that describes the GPO and press Enter.
05. Press Properties and select the Security tab.
06. Select the users or groups you wish to prevent having this policy applied to, or Add them, and clear the Allow column check box for Read and Apply Group Policy.
07. Press Apply and OK.
08. Press Edit.
09. Navigate to User Configuration / Administrative Templates / Windows Components and select Task Scheduler.
10. Double-click Disable Task Deletion and press Enabled.
11. Press Apply and OK.
12. If desired, double-click Disable New Task Creation, press Enabled, Apply, and OK.
13. Press Console / Exit.
14. Press Close.
15. Exit Active Directory Users and Computers.
NOTE: See the following tips: