Thanks for your explanation, @Goofball. I did that, and it worked. I am rooted, woohoo! A simple check like that should be added to ZeroNull's instructions, along with the need to install Acer's USB Driver on your PC.
Now, can anybody explain why ZeroNull's script won't detect the USB connection without the Acer driver, even though the stock Windows 7 drivers show the tablet is connected?