Choppy playback may be rectified by using a faster AVC decoder. CoreAVC is generally regarded to be the fastest, but it's not free. If you have a dual core (or higher) CPU, you might get acceptable results using the latest build of ffdshow with ffmpeg-mt enabled.
Or, if you have a video card with DirectX Video Acceleration (DXVA), you could try using Media Player Classic Home Cinema - the GPU does the decoding relieving some of the load on the CPU.