Different Cinematics problem...sentences cut short

My computer handles SC2 fine(specs below), cinematics look great, but very often sentences are cut a couple words short, even though other than that it runs fine. Also the mini cinematics do this. No other issues running the game whatsoever.

I couldn't find any problem like this...

4gb ram
win 7 64bit
e6420 at 3.2ghz
corsair PS
msi 4830 video card

 

My only idea is that you have a keyboard/mouse that is randomly typing or doing something, forcing the dialog to skip on its own. Try opening notepad or word and seeing if any random keyboard keys are typing.

I run into issues like this when my mouse is just getting old, and the right mouse button is worn out and clicking on its own.