Windows 10: Games crash after Windows 11 install

A couple of games I regularly play have been consistently crashing the system requiring me to hard restart. Valheim consistently crashes after playing for 10 - 30 minutes. Black Ops 6 not as often but it's the same crash and never happened before Windows 11. This started after I upgraded from Windows 10 to 11 24H2. I have no error message. The screen goes black and I can still hear the game sound for a bit before restarting. MSI bios is current as well as invidia drivers. Here's my specs: http://speccy.piriform.com/results/WvkCBdNCOOyuHf3WoGlk0BQ So far I've tried turning off Display/HDR to

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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?

 

windows xp installation and dual core am

could someone please list the steps they follow to install windows with a dual core processor and windows xp service pack to. I'm reletively new to amd dual core and i feel i'm missing a step. All help will be appreciated. thanx

 

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.