Windows 10: System and programs crashing, hard to find the culprit

Hello.I have a problem with my PC crashing mostly in new games, but it's stable under stress and in benchmarks. Mostly Unreal Engine games but not limited to them, I had crashes in Path Of Exile, The Finals, Rainbow Six Siege, Elden Ring. POE crashes were when there was a lot happening, but sometimes it crashes when nothing is happening and the FPS are stable, also in other games, Elden Ring was crashing when nothing was happening. The temps on CPU and GUP are under 70.The funny thing is that crashes in Elden Ring stopped on their own, but with the launch of the new game Throne and Liberty it

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all games crash!

I suggest you run rthdribl > http://www.daionet.gr.jp/~masa/archives/rthdribl_1_2.zip
Increase the window size step by step and watch your vga temps permanently.
What happens?
If it crashes, run at stock speeds as suggested before and retry.

P.S.: When your system locks, does the display signal turn off after a time?
Stuttering sound or no sound at all when freezing?
What X1800XT model do you own exactly?

 

Programs not working

In post 26 there were steps listed to fix the operating system corruption.
Are you able to follow them?
In post 29 was the suggested dism repair command.

 

all games crash!

ive watch my temps and both the cpu and gpu are within normal ranges. when it freezes it simply freezes the image and stops the sound. i must reboot to get back to windows.