Coloured screen, weird sound crash!

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I know there are a lot of topics about this problem. But i found an interesting thing. Now i have 2 computer. One is my old laptop and the other is the new ASUS G20aj. I deleted gameguard file on both of them. And when i start the game, my laptop installs the gameguard again, but the new one doesn`t install only opens the folder and install one file. I think this is the problem that causes all these crashes. I don`t know why but on both of them i ve windows defender. On my new computer i had Mcafee and avira but it was way before. What would cause this problem? i have seen some comments that the ethernet card is being the problem but i dont connect my pc directly to the modem, i ve wireless one, i connect the internet with wi-fi. Maybe modem is the problem? I don`t know, anyone have any idea?

 

Edit: Well i connect the same wi-fi with both of them, so modem cannot be a problem i think, right?