Enabling Task Manager

How to enable Task Manager again in Windows XP

Method : 1

On my Windows XP task manager(taskmgr.exe) is disabled (when I press Alt+Ctrl+Del opition "Task Manager" is greyed; when I try to start taskmgr.exe manually system display message "Task Manager is disabled by administrator". I have administrator right on my comuter.
Can anybody tell me how can I enable task manager again ?

•   Click Start
•   Click Run
•   Enter gpedit.msc in the Open box and click OK
•   In the Group Policy settings window
•   Select User Configuration
•   Select Administrative Templates
•   Select System
•   Select Ctrl+Alt+Delete options
•   Select Remove Task Manager
•   Double-click the Remove Task Manager option 

Method : 2

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

Method : 3

Download and run this REG fix and double-click it.
 the reg fix software can fix the registry problem.

Method : 4

• 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