Ugh, you're already in my taskbar! What use do you even serve by existing there!?
To get rid of it, you'll need admin rights for this to work. Look for "Command Prompt" in the start menu (and "Run as Administrator" if you have UAC enabled).
Paste in this command:
reg DELETE "HKEY_CLASSES_ROOT\Directory\Background\shellex\ContextMenuHandlers\ACE" /f
If all goes well, you should see "The operation completed successfully".
Enjoy your clutter free menu =)