I've read through these forums and have tried all that has been suggested, but I just can't seem to get these to play correctly. Specifically, if I download a movie trailer in .mp4 720p, it plays beautifully, but if I download a .mkv 720p TV show torrent (Heroes/Terminator/etc), the audio lags behind the video, making it unwatchable. It's already been established that my PC is capable of playing 720p, but this is really annoying me. Can anybody help? Should I include my dxdiag?