So I downloaded and started playing Dark Souls 3, and it was pretty laggy. I kind of expected it, because my brother's computer can't even start the game without crashing. It eventually got worse, to the point of being unplayable when I reached Vordt. So I got off the game and did other stuff on my computer for a while, and everything worked perfectly fine. Eventually, I had to leave to someone else's house, and my brother decides to use my computer to play Dark Souls 3. When I get back, he tells me that he played for about 5 minutes before the computer "locked up" right before the first boss. So I start using my computer after turning it back on again after I got back, and everything works fine for about 20 minutes, and then suddenly it blue screens. I turn my computer on again, and go about it business as usual, and about 15 minutes later it blue screens yet again.
So now I've run the computer in Safe Mode and run malwarebytes, and also ran the memory diagnostic tool. I got like 15 PuPs in Malwarebytes and nothing in the memory diagnostic tool.
Does anyone have an idea on how to prevent this from happening again? Something to note, is that the first time it blue screened for me, I was starting up MGSV, if that's relevant at all. My brother's saying that I probably just fried my graphics card since "I shouldn't have been able to run it in the first place."