To prevent Task Manager from starting in Windows, including via the Ctrl + Alt + Del key combination, via the context menu, and via Ctrl + Shift + Esc:
1) Open the Registry Editor (regedit): Start -> Run -> regedit.exe
2) Navigate to the following path:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
3) If there is no "System" key - create it, and go into that key.
-> System
4) Create a DWORD value named "DisableTaskMgr" and set it to "1".
That's it - you don't even need to log off/on - everything takes effect immediately.
To turn it back off - accordingly, delete this key.
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