Hi tombensve,
You can adjust the virtual machine menu shortcut key in Virtual Machine> Settings...> Applications Menu, then look for the Applications menu keyboard shortcut checkbox at the bottom of the window and its corresponding drop-down list of selectable shortcut keys. You can adjust the shortcut key to something you don't need inside the VM, or you can disable the menu entirely if you don't want to assign a key combination to it.
Cheers,
--
Darius