Computer freezing, game models stretching and pixel glitches

https://imgur.com/a/leXuT

What is wrong with my computer? Every game I play, freezes at some point, cursor still movable but thats the extent of it. Sometimes the pixel glitches out like that and other times the model stretches infinitely (League of Legends)

One thing to note, not sure if its significant or not, if I try to pull up task manager, I cannot alt-tab into it when the game hangs, but I can see the CPU and Memory usage is at 100%

Submitted March 31, 2018 at 07:08PM by keith976 https://ift.tt/2H0FHxI