I don't know what desktop you are using (Mate?.. Cinnamon?) But I am running Mint 17 Mate. What you should need to do is go to Menu > Control Center > Preferred Applications. Once there you should go to the Multimedia tab and set what you want to be the default for videos. Hopefully that works for you!
P.S. I LOVE your signature turtlebay! Very good choice!
Gateway NE56R41u laptop, 2.20 GHz x2, 4 GB DDR3, 128GB SSD - Linux Mint 17.1 (Cinnamon)
Dell Dimension E310 desktop, 2.80 GHz, 2 GB DDR2, 500GB HDD - Linux Mint 17.1 (Mate)