I haven't updated my video drive, but have installed some recent anti-virus and spyware. I did this because my computer was acting strange. The malwarebytes found several threats and they were removed. It still does not help with the playback of the movies.
What kind of computer (make and model if possible) are you running with what OS and what software are you playing your videos on? It could be that your video card is outdated or your capping the CPU or RAM.