I just got into ripping DVDs onto VCD. Before I started doing this I used to watch DVDs on my PC all the time using Windows Media Player. I never had a problem. Now when I try to watch a DVD it plays for a few minutes then the picture freezes but the sound still plays. I know there is nothing wrong with the DVDs because I've played them before and they work fine in my standalone DVD player. I tried more than 10 DVDs, all with the same result. However, every VCD I play plays perfectly. Does anyone have any ideas on what the problem could be?