Replying to Camera troubles, please help

I search bared but couldnt find anything, sorry if its a repost

I got a new camera, the Canon VIXIA HF20, its a good camera, but when ever i upload the videos onto my computer they get really choppy, the sounds on, but the video is really delayed and it more like watching a choppy slide show of random pictures at random points throughout the video. the computer is reasonably new its about a 2 year old pc. i was wondering if anyone else has had this problem, or knows anything about it

thanks