Actually you're going in the wrong way to find a solution to my problem
Alright then.
Fix it yourself.
~Lordbob
Lol, I knew I would of received an answer of that sort, it wasn't mean or anything, but going in the wrong direction can't help either.. I was just pointing that out...
I can't test it with another video card as I don't have any other
I'm going to take a look at the "green" HDD's snipermouse talked about and learn more about it
Also I installed both Microsoft Visual C++ even if they were already installed, just in case.
Yea it could be power supply if it doesn't gives proper power, but this thing happened while watching youtube video

?
I'm gonna bring it back to that pc company and clearly ask them to try with another video card ( or other piece, one by one.. ) and test it with mafia 2 ( yea new game and it happened also )
Oh and I don't see anymore an HD4200 driver installed in my device manager, I don't know how but it's no more there
Don't get me wrong Lordbob75 , I am grateful for you guys time trying to help me out with my problem