3 methods to Enable Task Manager.

Method 1

Click Start, Run and type this command exactly as given below: (better - Copy and paste)

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REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 0 /f

Method 2

Open notepad and type

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]
"DisableTaskMgr"=dword:00000000 

  And save the file as abc.REG(.reg is important)

Method 3

Click Start, Run and type Regedit.exe

• Navigate to the following branch:

HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies\ System

• In the right-pane, delete the value named DisableTaskMgr
• Close Regedit.exe