If this doesn't help, you might try a couple other drivers to evaluate whether this erratic behavior is driver-independent. Here's what I'd recommend.
- Look at the mouse device in Device Manager and make note of your touchpad manufacturer. (Sentelic or Synaptics)
- Uninstall its driver (in Control Panel), and reboot.
- When you reboot, Windows will install its own generic mouse driver. It won't have the multi-touch gestures, but it's functional. Use that for 2-3 days to see whether the erratic behavior occurs with that driver.
- Download the latest version of the manufacturer's touchpad driver. Install it and reboot.
- Do a repair install of the ATK Package in Control Panel, and reboot.
- Use that driver for a few days to evaluate the erratic behavior.
If the touchpad exhibits the same problem under all these circumstances, it's probably bad hardware. If you are still within your retailer's return window, send that computer back and get a replacement. If not, the only true repair is touchpad replacement. But if you have a Sentelic TP and want to just use an external mouse, using driver v.188.8.131.52 should allow you to turn the touchpad off.