Occassionaly it is possible to lose the VeSys menu's, the steps below should enabe you to get the menu's back:
Depending on your AutoCAD version type 'menuload' for versions upto 2005 or 'cuiload' for AutoCAD versions 2006+
Unload the VeSys menu's if they are there.
Click 'Browse' button to locate the VeSys menu's, you will need to navigate to the VeSys Electrical Series\VeSys Design folder and select the menu file that is suitable for your version of AutoCAD (at present there is no difference between the various verions of the mns files or cui files).
Click the 'Load' button and you menu's should have returned.