Disabled Registry Editor & Task Manager

You may some times receive an error stating that

Registry Editor has been disabled by Administrator.

Task Manager has been disabled by Administrator.

Resolution for this is Add the below keys in to registry.
Save the below contents in a notepad file with .reg extension and run it.
----------------------------------------------------------------------------
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]"DisableTaskMgr"=dword:00000000
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]"DisableRegistryTools" =dword:00000000
----------------------------------------------------------------------------

or

Go to Start-->Run and type

For Registry Editor

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

For Task Manager

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

And it will be enabled.