Here comes the Solution.

It is due to some kind of virus/ trojan activity which normally disables the task manager.Now due to this problem when ever the user press alt+ctrl+del to launch windows task manager it gives an error saying “Task Manager is being disabled by your administrator”.


Solution:

To Enable the Disabled Task Manager on your system

1. Press window key+r to show run prompt
2. Follow the following steps

• Enter gpedit.msc in the run prompt 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’.
• Set the property of this item as disabled.

For Those who use Windows XP Home Edition can use the registry to enable Task Manager

1. open start --> run and type regedit

2. Navigate to the following path:

Hive: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
3. You will find a registry key with name DisableTaskMgr of type: REG_DWORD
4. Double click the key with and set the Value to 0
5. Exit the registry and restart to see the effect.



Courtesy:-Praveen kumar