If I.E or any other process is hogging 85% of your processor while you're watching vids then that will degrade playback. Try watching in Firfox see if that makes any difference.
p.s. Of course your desktop needs to be up to the task. If it's single core forget about smooth flowing High Def..unless it's 3.8GHz or something.
p.s. Of course your desktop needs to be up to the task. If it's single core forget about smooth flowing High Def..unless it's 3.8GHz or something.