I've had something similar with my HP 8710p laptop...it would show green "checkerboard" patterns over the area where the Flash video was playing. This happened on YouTube, Netflix...any Flash at all. And it would only happen when I had the NVidia driver set to "DualView".
Anyway, if updating a driver causes a problem, the rule of thumb is simply to stop updating drivers unless you really need to! Not all new driver releases will enhance performance in all system environments. Have you tried rolling back the driver through the Device Manager?