This is an annoying prompt most Windows XP users face when trying to access Task Manager by pressing ctrl+alt+del buttons.This error is caused if the DisableTaskMgr restriction is enabled following a Windows Update or in the worst case scenario - A virus attack! You can remove this by doing one of the following..

Click on Start > Run and type the following

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

Or Download this file and double-click on it to add the above registry key automatically.

Or you can also try Group Policy editor on 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.
  

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