Missing task manager

When I press Ctrl +  Shift + Esc to enter the task manager it does
not open the task manager window. I miss the  taskmgr.exe  file
from that path HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image
File Execution Options\
What should I do?

is there any error message "Task Manager has been disable by your administrator" , maybe this caused by virus, but we can do it manually after make sure PC no viruses
Method 1 :
 - Click Start,
 - Run
 - type :
 REG add HKCUSoftwareMicrosoftWindowsCurrentVersionPolicies System /v DisableTaskMgr /t REG_DWORD /d 0 /f
Method 2 :
 download and run this REG fix and double-click it.
http://windowsxp.mvps.org/reg/EnableTM.reg
Method 3 :
 - Click Start
 - Run
 - type Regedit.exe
 - find :
 HKEY_CURRENT_USER Software Microsoft Windows CurrentVersion Policies System
 - at the right panel, delete value DisableTaskMgr
 - Close Regedit.exe
Method 4:
 using Group Policy Editor - for Windows XP Professional (maybe worked with Windows 7)
 - Click Start
 - Run
 - type gpedit.msc and click OK.
 Find : User Configuration / Administrative Templates / System / Ctrl+Alt+Delete Options / Remove Task Manager
 - Double-click Remove Task Manager
 - Set the policy to Not Configured

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