Enable / Disable Task Manager

There is a registry hack to enable or disable Task Manager.
Hive: HKEY_CURRENT_USER Key: Software\Microsoft\Windows\CurrentVersion\Policies\System Name: DisableTaskMgr Type: REG_DWORDValue: 1=Enable this key, that is DISABLE TaskManagerValue: 0=Disable this key, that is Don’t Disable, Enable TaskManager.
If you are an Administrator you can consider  using Group Policy Editor. For that,

Click Start
Click Run
Enter gpedit.msc in the Open box and [...]