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The following knowledgebase will help you to resolve the error message "Task Manager has been disabled by your administrator" when you try to use "Task Manager"
When you try to open Windows Task Manger, the following error may appear: "Task Manager has been disabled by your administrator".
1. You use account that was blocked via the "Local Group Policy" or "Domain Group Policy".
2. Some registry settings block you from using "Task Manager".
1. Verity that the "Local Group Policy" or "Domain Group Policy" doesn’t block you from using
1.1 "Local Group Policy"
a. Go to "Start" -> "Run" -> Write "Gpedit.msc" and press on "Enter" button.
b. Navigate to "User Configuration" -> "Administrative Templates" -> "System" -> "Ctrl+Alt+Del Options"
c. In the right side of the screen verity that "Remove Task Manager"" option set to "Disable" or "Not Configured".
d. Close "Gpedit.msc" MMC.
e. Go to "Start" -> "Run" -> Write "gpupdate /force" and press on "Enter" button.
Note: If you are using Windows 2000, please follow KB q227302 instead stage "e".
Using SECEDIT to Force a Group Policy Refresh Immediately
1.2 "Domain Group Policy"
a. Contact you local IT support team.
2. Verity correct registry settings::
a. Go to "Start" -> "Run" -> Write "regedit" and press on "Enter" button.
Warning: Modifying your registry can cause serious problems that may require you to reinstall your operating system. Always backup your files before doing this registry hack.
b. Navigate to the following registry keys and verity that following settings set to default:
Microsoft Windows XP Professional, Microsoft Windows XP Home Edition, Microsoft Windows XP Tablet PC Edition, Microsoft Windows 2000 Enterprise Edition, Microsoft Windows 2000 Professional Edition, Microsoft Windows 2000 Standard Edition, Microsoft Small Business Server 2000 Standard Edition, Microsoft Windows Small Business Server 2003 Standard Edition, Microsoft Windows Small Business Server 2003 Premium Edition, Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems, Microsoft Windows Server 2003, Datacenter Edition (32-bit x86), Microsoft Windows Server 2003, Enterprise Edition (32-bit x86), Microsoft Windows Server 2003, Web Edition, Microsoft Windows Server 2003, Standard Edition (32-bit x86)