Help needed!!

I am running an i3-2100 using built in graphics. I have the latest driver installed, as well as adobe flash, but youtube videos are not playing smoothly. This happens both in fullscreen and the normal size.

I noticed in my Sony laptop there is java, MSXML 4.0 SP2, microsoft visual c++, directx, shockwave player, and .net framework 4.0. These programs are not installed on the pc in question, because I built it myself and used a windows 7 x64 fresh install.

How can I get smooth playback? Do I need any of these things installed? Can anyone suggest trying something else?

btw, 1080p movies in vlc play no problem.

Thanks in advance, very appreciated.