I have a Toshiba Satellite laptop that runs on Windows 8. I just recently got this laptop and I like to play games on it. Without an external mouse, I can't use the keyboard (except for the buttons Shift, CTRL, FN, and ALT) while moving my touchpad. I've looked a few other threads but none of them seem to have an answer for Toshiba Satellites.
Users of laptop had been facing some issues in the past accidentally the palm of their hand brushing the touchpad, changing the position of the cursor in their document or accidentally clicking on an option. To avoid such issues some background applications are used to avoid using the touchpad and the keyboard together. Kindly check with Toshiba Support if there is any such applications running in the background. Also check the User's Manual of the Laptop.
There is a fix available if the touchpad is manually disabled, please check the below mentioned link: