Touchpad problems after using left handed mouse

[FaithHope]

I have a toshiba satellite pro and usually use the touchpad with my right hand rather than a mouse. I attached an external mouse for my daughter to use, and changed the settings to lefthanded. I disconnected and shut down. Since then, each time I restart the computer, the touchpad does not work correctly. Instead of double clicking on the touchpad, I have to rightclick. I have to go into mouse settings on control panel, and move the double click speed, click apply and then the touchpad works correctly then. Why is this? Please help.