How to Fix - Computer freezing after 30 min of running a game?

Computer freezing after 30 min of running a game

Ok so a few weeks ago my computer kept getting the bluescreen and I posted a question on here and got it fixed.
I updated some of the drivers on my motherboard(Sound and USB) and that fixed the issue.
Well a few weeks later and now my computer doesn't
bluescreen but instead just completely freezes and locks up to the point where I have to shut it off with the power button.
Since you guys were such a great help last time I was hoping you might be able to help me solve this issue.
It happens after about 30
minutes or so of running some games(Borderlands 2, Assassin's Creed, Battlefield 4, etc).
I am assuming some driver somewhere needs to be updated but I have no idea which one or how to find out.
Windows 7
AMD FX 8120
AMD Radeon 7800 series
16gb RAM
MB GIGABYTE GA-990FXA-UD3

Solutions to the Problem Computer freezing after 30 min of running a game

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Use the System File Checker tool to repair corrupted or missing system files:

1. Click Start.
2. Type cmd, and then press CTRL+SHIFT+ENTER to open the elevated command prompt (I.e. Command prompt with administrative rights).
3. The User Account Control window should appear, be sure that the action it exhibits is correct, and then press the Continue button.
4. Type or copy paste the below command line into it without quotes:
5. "Sfc /scannow"

Another Safe way to Repair the Problem: Computer freezing after 30 min of running a game:

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