Use an extra large virtual pointer for your live presentations, with PointerStick
PointerStick is a free program that lets you enjoy a virtual pointer no one will fail to notice in your presentations.
You can form your virtual sticker as large as you like, change its color, make it even transparent as much you prefer to let it be visible without covering completely the information of your document.
PointerStick can be active immediately when you start Windows, or just wait silently at the tray. It can appear and disappear even with keyboard shortcuts.