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Summary: Task manager can be disabled manually, but more commonly it's disabled by a virus. It's easy to re-enable once you're virus-free.
My task manager has a "task manager has been disabled by the administrator" message. How did this happen and how can I correct this?
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Why: if you didn't do it yourself, the news isn't good.
How to fix it: there are a couple of ways.
Let's look at this more closely.
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The situation's pretty simple. If you right click on the clock in the Windows taskbar, the Task Manager item is grayed out:

Or, if you try to run taskmgr.exe manually, you get this message:

So, how did this happen?
As we'll see in a moment, there are settings you can access as an administrator that would allow you to disable and enable Task Manager in this way.
You didn't do that, you say?
Then a virus probably did.
Disabling Task Manager is one way viruses try to make it harder for you to deal with their infections. Before proceeding any further, you should run a complete and up-to-date anti-virus scan of your machine. It's possible, perhaps even likely, that you've been infected.
Once you come back virus-free, you can proceed with the fix.
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If you have Windows XP Pro, there's a nifty user interface to directly edit the setting you want to repair. Click Start, then click Run and type in gpedit.msc:

And press OK. This runs the Group Policy Editor.
Once in the Group Policy Editor, expand in turn:
User Configuration
Administrative Templates
System
Ctrl+Alt+Del Options
You should see something much like this:

Double click on Remove Task Manager to change its setting:

It should be enough to click on Not Configured and then OK and Task Manager is available once again.
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If you don't have Windows XP Pro, then you'll need to edit the registry manually.
Click Start, then click Run, type in regedit, and click on OK.
Expand these registry keys in turn:
HKEY_CURRENT_USER
Software
Microsoft
Windows
CurrentVersion
Policies
System
You should see something similar to this:

Right Click on the DisableTaskMgr item:

Click on Delete, confirm that you want to delete, and Task Manager should be available once again.
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One thing to note is that it's quite possible that if you're in an environment managed by a centralized policy, these settings may have no effect. Your IT administrator may set things up so as to disable Task Manager, and other things as well at the domain level. You'll need to ask them if this is the case.
Article C3088 - July 16, 2007
I used all the options that you mintioned but all the tries failed so do I have a virus? And please if you don't mind help me fix my laptop by answering my questions...
Thanx..
01-Aug-2010
Posted by: memo at August 1, 2010 1:40 AM
You can use RRT to enable task manger and regedit and other automaticaly
Posted by: kosay at August 3, 2010 7:26 AMRunning these two commands from the command prompt would solve the problem. Additionally, you may paste these lines into a notepad and save it as a batch file on desktop, then just running the batch file you remove restrictions on Task Manager and Registry Editor:
REG ADD HKCU\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\POLICIES\SYSTEM /V "DisableTaskmgr" /t REG_DWORD /d 0 /f
REG ADD HKCU\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\POLICIES\SYSTEM /V "DisableRegistryTools" /t REG_DWORD /d 0 /f
Posted by: Waqar Mushtaq at August 11, 2010 4:32 AMRight clicked on clock and Task Manager was not grayed out, but still could not access. Followed regedit instructructions, but file mentioned was not present.
Must be a more sophisticated bug.
Posted by: Mark at August 13, 2010 4:58 PMeven after doing so ...task manager is not available
Posted by: aasif at August 23, 2010 3:42 AM