Windows 10: How can I fix this glitch or crash situation?

When I play GTA 5, after some time of playing, my screen will freeze. The only way to fix the freeze is unplugging the whole pc, my power button on the actual computer doesn't even work when it is frozen like this. How could I fix this from happening?

:)

 

GPU-Z 0.8.7 crash on launch

W1zzard is asking you to test so that he can suggest next steps and be able to troubleshoot the issue you have.
If another version works, it would be one set of steps.
If several other versions also fail/crash, then it would be another.

 

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?

 

Graphics glitches and Crashes

Since the BIOS update, I've had no major issues whatsoever. Everything works fine.

But minor issues such as random flickering and that purple outline issue have appeared. These are barely noticeable but I'm worried they might be a sign that there might be issues again in the future.

But since it's been confirmed that the BIOS update fixed the major issues such as everything crashing and all of the random glitches, it's most likely still a software issue.

Yes, it's still possible that it's a hardware issue, but I doubt it now.

And the 9500 GT's confirmed to work fine with Windows 8. It's on Nvidia's Windows 8 compatibility list.

I agree with MailMan. I've researched a lot of possible issues just in case, and a lot of issues are caused by software. If you work in tech support, I doubt you find that the majority of issues are caused by hardware as most users have pre-built PCs. Just my two cents.