My camcorder (Sanyo Xacti HD2000) captures video at 1080p / 60 fps. Sadly my computer doesn't seem to be able to keep up and whenever I play it back, the video becomes extremely choppy.

Is there anyway I can down sample the video to 720p or even to 480p, but preserve the frame rate? I'm using Cyberlink PowerDirector and I can't get the file to look decent a lower resolution, but it always seems to convert the video to 30fps when I do this. The video is an action shot so I'd like to keep the frame rate up.