Computer freezing on kcd

Mar 3, 2018
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Hey, im getting frustrated with my pc i have..
Intel 8th Generation Intel® Core i7 8700K 3.7GHz Six Core Processor
16GB Corsair Vengeance LPX Black DDR4 3200MHz
Samsung 960 EVO 250GB NVME M.2 SSD
Seagate BarraCuda 3TB 64MB Cache Hard Drive SATA 6GB/s
NVIDIA GeForce GTX 1070 8GB GDDR5

The problem started last week on kingdom come deliverance, which at first i thought was the games fault as it is fairly glitchy but now have come to the conclusion it must be something else.

I was playing the game and getting constant flashing black squares on screen which then resulted in the game freezing and eventually crashing, i ran other games and at this time thought it was just kcd, however now my game freezes occasionally on rocket league.
I have updated all drivers, removed and placed graphics card back in and ran loads of different software to find the problem with no luck.

After running furmark, system file scan, ddu i then had the blue screen of death and the computer is progressively getting worse as ive had to re install windows after my pc died.

I ran the resource and performance monitor on windows and found that i had a cpu running at 99% which is not normal??

Please can someone help, would be much appreciated
Thanks in advance