Method 1:
> Open Run window and type gpedit.msc and click ENTER.
> Now Goto location: User Configurations/Administrative Templates/System/Ctrl+Alt+Del Options
> Double click on Remove Task Manager on right side Pane. And select the value as "Not Configured" as follow.
Method 2:
> start "RUN" Window and type regedit and Enter
> GoTo this registry index: HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies\ System
> In the right pane, find and delete the value named as DisableTaskMgr
> Close Registry Editor
> Open Run window and type gpedit.msc and click ENTER.
> Now Goto location: User Configurations/Administrative Templates/System/Ctrl+Alt+Del Options
> Double click on Remove Task Manager on right side Pane. And select the value as "Not Configured" as follow.
Method 2:
> start "RUN" Window and type regedit and Enter
> GoTo this registry index: HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies\ System
> In the right pane, find and delete the value named as DisableTaskMgr
> Close Registry Editor
