Have you ever experienced this? Pressing Ctrl + Alt + Del but the Task Manager didn’t come out but only show you message that the Task Manager was disabled by Administrator. The problem is, you are the admin!
This problem might occur if your pc is infected by virus. Some AV just clean up the virus but doesn’t fix the registry key cause by the virus. If you want your Task Manager back, here’s an easy way.
Open up your registry editor by Run|Regedit.
Browse to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System.
Then find a key named DisableTaskMgr. Double click it and change the value to 0.
Playing with registry can bring disaster. So I give you an alternative way.
Open group policy object editor by Run|gpedit.msc
Browse to Local Computer Policy|User Configuration|Administrative Templates|System|Ctrl+Alt+Del|Remove Task Manager
Enable Task Manager by disabling the policy.
Good Luck.