Windows 7 Computer Management failed to start by right clicking Computer

Windows 7 Computer Management could be started by right clicking Computer, and choose Manage.
However, sometimes this method just do not work.

Perform these steps to solve the problem:

1. Launch the Registry Editor.Press Windows key > Type regedit >  Press Enter > Click on Yes.
2. Browse to
   HKEY_CLASSES_ROOTCLSID{20D04FE0-3AEA-1069-A2D8-08002B30309D}shell Managecommand
3. Replace the default string value to
   "%SystemRoot%System32mmc.exe" "%SystemRoot%system32compmgmt.msc" /s
4. Close Registry Editor.

You should now be able to right click Computer and choose Manage, to launch Computer Management.