I burn alot of DVDs. They used to run fine in me media player. I have a HP Desktop comp. I upgraded my video card to play games on my comp, and I upgraded the processor. Geeksquad told me to do so. Now when I watch movies on my comp, The sound is normal but the video is choppy and slow. But this only happens after the comp. has been on for about and hour or two. maybe its another program starting up or something but I cant see the programs starting.What should I be looking at?