Task Manager provides information about applications currently running on your system, the processes and memory usage or other data about those processes, and statistics about memory and processor Performance.
This method shows you how to Disable/Enable Task Manager from Registry Editor
Please perform the following steps:
Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Microsoft official disclaimer
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
Please navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System and locate DisableTaskMgr registry key
Please confirm User Account Control pop-up
Double click on DisableTaskMgr and edit the value:
To Disable Task Manager:
Change the data value with 1
To Enable Task Manager:
Change the data value with 0
To finish press ok button and close Registry Editor window