I've had similar issues in the past with Netflix. Usually, it's a Netflix problem, not a GPU problem. I would however update to the latest drivers, and there is a newer version than what you have, and I'd do it by performing a CLEAN install rather than just updating over the top of what is installed now. A CLEAN install of the newest drivers has cured this issue on a few occasions in the past. Other times it was simply due to poor internet connections or throttling by Netflix. Might also have to change the quality setting on your netflix options if some movies do it and others don't.
How to perform a CLEAN install of video drivers:
http://www.tomshardware.com/faq/id-2767677/clean-graphics-driver-install-windows.html