Maybe unrelated, but I find when I transfer video from the card to my desktop, I get quite a bit of freeze, smooth, freeze, smooth choppiness.
But if I load to YOUTUBE, or do some minor video editing (Windows Movie Maker), all is nice and smooth.
Don't know why...
I would think viewing the video file directly would be nice and smooth.
Eight year old computer at issue? I would think it still has pretty decent specs, including quad core processor.
HP Pavilion p6774y Magnesium Gray Edition Desktop PC Product Specifications | HP® Customer Support