I have a label "mycomp" and I use this:
mycompOnLeftClick !execute ["$FileManager$" /n,/e,"$drives$"]
and it works, when I'll put this:
mycompOnLeftClick "explorer.exe /n,/e,$drives$"
- don't work
mycompOnLeftClick !execute ["explorer.exe /n,/e,$drives$"]
- don't work
mycompOnLeftClick !execute ["explorer.exe" "/n,/e,$drives$"]
- it opens "C:" in a fullscreen without folders on left

so please, write me, what i have to put in mycompOnLeftClick to open MyComputer with explorer.exe ($FileManager$), not in fullscreen and without folders on left :) thanks