This way you only need to download this very lightweight tool to your computer and run. Then choose Fix Task Manager .
If there are any errors, right-click Run as Administrator to open the tool.
Step 1 : Select Start in the search box, type Run command (or shortcut Windows + R ), a Run dialog box appears on the screen
Step 2 . You type gpedit.msc and press Enter as shown below
Step 3 : On the computer screen, the Local Group Policy Editor window will be displayed as shown below
Step 4 : You select the order according to the path to the section User Configuration / Administrative Templates / System
Step 5: Select the function Ctrl + Alt + Del Options as shown below
Step 6: Double-click on Remove Task Manger on the right side, a window named Remove Task Manger will appear, select Not Configured and click Ok to activate this function.
Note that you remember to restart the computer after completing the above steps. Good luck