I never heard of games freezing your computer before unless you are trying to play them all at once. I have had about 3 dozen installed on my machine at one point in time without any problems. So it has go to be something else.
I do not accept support questions via EMail, PM, IM or my G+ page!
Phone: LG Optimus G Pro
Running: Stock JB from LG with Nova Launcher
another possibility is you have a crappy PSU, or a good one thats dieing, or your harddrive is dieing on you, Youll know your HD is going when it makes werid clicking sounds or hums alot, as a last resort you could reformat that solves alot of problems.
I know a PSU can cause a computer to freeze because my computer has been freezing like urs and i traced it back to my X-connect, Im Still waiting for my new PSU to arrive from newegg but im sure it will stop my crashes.