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When you try to open Task Manager, the following error may occur:

Task Manager has been disabled by your administrator

This error is caused if the DisableTaskMgr restriction is enabled. To enable Task Manager, try one of these methods:

Method 1
Click Start, Run and type this command exactly as given below: (better - Copy and paste)

Code:

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

Method 2
Download and run this REG fix and double-click it. Here
http://windowsxp.mvps.org/reg/EnableTM.reg

Method 3
Click Start, Run and type Regedit.exe
Navigate to the following branch:

Code:

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

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

Method 4:
Using Group Policy Editor - for Windows XP Professional
Click Start, Run, type gpedit.msc and click OK.
Navigate to this branch:
User Configuration / Administrative Templates / System / Ctrl+Alt+Delete Options / Remove Task Manager

Double-click the Remove Task Manager option.
Set the policy to Not Configured.
http://windowsxp.mvps.org/reg/EnableTM.regGet it here

Warning if you are regular user don/t try if you unsure. See expert for consultation or Drop your problem in this forum.