Type regedit in run box and browse to:
HKEY_CURRENT_USER >
Software\Microsoft\Windows\CurrentVersion\Policies\System
on right pane find reg word "DisableTaskMgr"
double click it and change it's value to "0"
You r done
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But if the TaskManager was accidently disabled or you need to control this item for a set of standalone boxes this is for you:
- Click Start
- Click Run
- Enter gpedit.msc in the Open box and click OK
- In the Group Policy settings windowSelect User Configuration
Select Administrative Templates
Select System
Select Ctrl+Alt+Delete options
Select Remove Task Manager
Double-click the Remove Task Manager option
And as I mentioned above, since the policy is
Remove Task Manager, by disabling the policy, you are enabling the Task Manager.