If you're just using the Lcd and keyboard all you need running is LCDmon.exe and whatever applets your running. You can disable them by using the manager in the tray or by deleting/moving them from the applets folder. My folders at:
C:\Program Files\Logitech\GamePanel Software\LCD Manager\Applets
LGDcore.exe is for the G key macros, if your not using it do as above, find, move/delete.