I had a similar problem to this when I first updated to Windows 10, can't for the life of me think I resolved it. Now I seem to be having the same problem after the anniversary update. After googling it seems to be a problem affecting Asus laptops especially. I've checked and, as far as I can teel, all the drivers are up tp date.
Basically, the problem is that, since the anniversary update, the touchpad on my laptop has become ultrasensitive. Tabs open up twice instead of once, if I click play on youtube it plays thne pauses again, if you get my meaning. Etc etc. Any idea what I need to do to get the touchpad working normally again.