Choppy audio & video playback

Depends on your YouTube setting, maybe the video changed to HD when you played it full-screen, and because of slow download, the video became choppy.
 
When I go to youtube and play a video, it plays fine until I put it on full screen and then it becomes choppy.
Either your VGA isn't up to the task, or your internet bandwidth isn't sufficient. Those are the two most common reasons for issues with streaming.

If a video is indeed, 480p, then your graphics card has to scale it to your display resolution when it's being played full screen.

As far as Adobe Flash goes, who knows, (or cares), whats going on with that.

Your, "Plan B", might be to use Firefox, and add on "Video Download Helper". In which case, that will take internet connection speed out of the equation. You download the video, and simply play it back with VLC, or WMP. You can usually pick from a number of resolutions and formats, (.wmv, .Mp4, etc.< (although "etc"., is not an actual file extension ;)), to download.
 
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Update graphics card/chip drivers, as captaincranky says above it's probably related to this now.
 
Also, if you're using chrome, all youtube videos now run in HTML5 and not flash. For some computers, HTML5 runs a lot worse than flash. If that's the case, just use a different browser and it should play fine.
 
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