Hi Tim,
Are you using a laptop by chance? If so, you can resolve this issue by taking a look at your touchpad options. If you're using Windows 7, click the Start button, type Mouse in the search field, and click Enter. There should be an option to change the Device Settings for the TouchPad. On many models, Synaptics is the maker of the TouchPad and has a Tab of its own in the Mouse properties. If you don't see these settings, you'll need to install the drivers from your manufacturers website.
For Dell machines, you can go to support.dell.com. Select your model and you'll find the driver under Input Device Drivers. For Compaq/HP machines, go to support.hp.com, select your model and find Keyboard, Mouse and Input devices.
I like to disable the Tap option and raise the PalmCheck sensitivity option. These are the first options I always change when I get a new laptop; otherwise I have the very same problem.
Hope this helps,
Barbara