All games lag after installing skyrim and dx july 2010.

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Jan 17, 2015
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Hello everyone, so all games been lagging and shuttering on my brother 's laptop lately, and i think i might know why but i want to know how to fix it, so first let me start with his specs:
6GB RAM
R7 M260
Intel core i5 4200U.

so, games used to work great on his computer, but it started lagging and shuttering lately, he reset his computer, installed all his games and everything worked fine (Except for skyrim, he had to install dx july 2010 because there were some missing stuff like xinput and some audio files that i don't remember.), then his games started lagging again, i started suspecting skyrim and direct x. then he reset his pc again, everything worked fine, but, after he finished installing skyrim, and dx july 2010, i waited for the moment he opened the game, then everything went back like what it was, and everything statred lagging and shuttering, now i would like someone to help me to fix this problem. thanks!