Windows 10: Windows crashes after login

My PC starts up fine, I enter my pin, and then Windows crashes. I have restarted many times and every time it does one of these:- black screen with nothing on it. I can move the cursor around but can't do anything.- my desktop is there, but none of the startup programmes load, most of my icons have blank pages, and I can't click anything. Or I click one thing and I get the error "Program not responding."I've tried the fix where you power off during startup twice and restart - windows said it was automatically fixing itself, but it's not made a difference.RIght now my PC has been on for about 1

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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?

 

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.

 

Add-Ons for Firefox crash since update to 80

I left Firefox open over night and attempted to login to LastPass this morning - all the addons crashed. I had Firefox Task Manager open at the time and before attempting the login all addons were in the list and not using very much resources. After attempting login, all of the addons disappeared from the Firefox Task Manager list.

I will try the additional suggestions.

If I want to try a new profile without losing my saved/sync profile (and hopefully with the option of syncing my data back into the new profile) what steps should I take? Or is it just a given that if it is profile corruption, the sync profile is junk...?

Thanks!