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Besides system information, Task Manager can also be used to set process priorities, processor affinity, forcibly terminate processes, and shut down, restart, hibernate or log off from Windows.

How to Disable Task Manager

1. Click Start -> Run, and then type regedit, then press Enter. In Windows Vista, just type regedit in Start Search, and press Enter.
2. Navigate to the following registry key:
To block Task Manager from current logged on user:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

To block Task Manager on local computer for all users:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System

Note that if “System” does not exist, simply create a new key by right clicking on Policies, and select New -> Key, and name the new folder as System.
3. Right click System registry key, and then select New -> DWORD (32-bit) Value.
4. Name the new registry entry as DisableTaskMgr.
5. Double click on DisableTaskMgr, and assign its value data as 1.
6. Quit Registry Editor.

How to Disable Task Manager

1. Click Start -> Run, and then type regedit, then press Enter. In Windows Vista, just type regedit in Start Search, and press Enter.
2. Navigate to the following registry key:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
3. Locate DisableTaskMgr in the right pane.
4. If found, right click on DisableTaskMgr, and select Delete to remove the registry entry, or set its value data to 0.
5. Then navigate to the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
6. Locate DisableTaskMgr in the right pane.
7. If found, right click on DisableTaskMgr, and select Delete to remove the registry entry, or set its value data to 0.
8. Quit Registry Editor.