[Vince, Pt. II]

So I'm running a dual-monitor setup with my Sony laptop. The graphics card has an HDMI out, and I'm running a cable to a separate monitor. I run video games in windowed mode maximized on the second monitor, and I use the laptop screen to run Firefox, etc.

My problem lies in that oftentimes I'll be in game on the second monitor, and I'll right click - but instead of performing the right-click function for the game, it will pop up a windows menu (as if I had right-clicked on the desktop) right in the middle of my game, interrupting it (and usually screwing up whatever it was I had been doing). I've searched for the problem online but am coming up with nothing.

My first thought was that something on the laptop screen running in the background had popped up as active, therefore making the mouse think that a right click should pop up the menu, but I can't seem to find anything that would lead me to believe that is the case. Any help would be appreciated!