After I install 10 my touchpad may do what the basic Microsoft pad driver supplies. It's a common complaint that most solve by heading back to the laptop's maker's web page for their laptop and installing the latest touchpad driver for 10.
So I installed Windows 10 and now my touchpad operates differently than before. A single, left click now operates like two clicks. So I click once on compose in my mail browser and two new message windows pop up. I've tried adjusting speed in settings but it doesn't seem to change the situation.