Wacom Bamboo and VMWare Fusion

I recently purchased a Wacom Bamboo tablet in the hopes of having better control over my actions in Adobe Photoshop (which is ran primarily via Vista in VMWare Fusion). Well...the action part is okay; however, I can't seem to get the eraser function of the pen to work. It writes pretty well, though I'm confident that is not its major purpose. I want to be able to use both the pen and the eraser to take full advantage of its supposedly intuitive design, but, for the life of me, I cannot seem to figure out why my eraser nub is not working.

Help?

Any tips and information is greatly appreciated!