Affiliate Marketing Secrets

I just now got Windows 8 on a new laptop I just got a 2 days ago, I previously had windows 7 which I loved. The problem is, every time I’m just scrolling on the internet, and my finger is normally propped on the left side of the mouse, and I go over to click something, making me scroll to the right in a sideways way, it takes me to normally a microsoft calender on the home screen, or a previous thing I had up earlier that day.
How do I stop this? It’s extremely frustrating, and I’ve browsed through the mouse settings, but I have yet to figure out this annoying problem.
Any help would be much appreciated.