Even on a dual 1Ghz machine such as mine it is extremely choppy. Stick with the old one! It is kind of funny when you think about it though... a dual 1Ghz machine can't run an NES game. Oh well, the old (3.1.3) version was perfect as far as I could tell anyway (except for the sound... keep reading). I hope it is still available for people to download. I may be a moron but I can't get the sound to work properly. It plays in stereo whereas the NES was mono. Perhaps a toggle?