Windows 10: June 2019 blue sign in screen but blinks out sign in

So June update happened 2 days ago. Now I can't log in. Blue screen with 3 icon screen, wifi power, and windows. When I click screen it cycles my sign in and circles and goes back. Now it's black screening. Last month it was snail pace 100% disk from 4-5 programs. Took a few days to get thru stopping ****. Please lmk what I can do. I'm hosed if I lose my data on computer. I'm on disability and can't afford new computer or to send it out. Thank you in advance. I can't power off with power button cause it stopped working. I have a media button on my Toshiba laptop.

:)

 

different lock screen and sign in screen?

Step 2b is labeled as Change the Login Screen Image, but the steps show you how to change the Lock Screen image. Step 2a is irrelevant. It only tells you how to change the desktop background.

What I want to do:
Set Spotlight as the LOCK Screen Image(s) - Done
Set the Win 10 Hero Image as the SIGN IN Screen Image - This is the one that shows after you click on the lock screen and you are able to type your password. If I uncheck "Show Lock Screen Image on Sign In Screen", it shows a solid blue background behind my Password box and user image. This is what I want to change to the Hero Image....

 

message sign blinking

a message sign is continuously blinking on the top of my nokia 500 whenever i'm using my vodafone sim...though there is only 72 text msgs in the inbox...and no unread msg there. With other sim card i found that there is no problem...this is occuring with
one particular sim card....can not resolve the issue...suggest a solution pls...

 

How to troubleshoot an error that appears only at Restart or Sign out?


I get an error pop-up error message not every, but almost every time I Restart or Sign out. It's the screen with blue background and on top of Restart or Sign out text an error window says:

Explorer.exe - Application error. The instruction at 0x000… referenced memory at 0x000... The memory could not be written.

Sometimes the error code is just zeros, sometimes random numbers. I have tried so much already to troubleshoot this. For example these did not help in any way:

• MemTest86+ (no problems)
• Disabling any Services, Autoruns/ShellExView entries
• Low resolution mode
• BIOS settings are fine, no overclocking etc.
• DISM.exe and sfc
• etc.

However, these do make the error go away:

• End process for explorer.exe before Restart or Sign out
• Safe Mode
• Creating a new user profile (almost the same as clean installing Windows, many full days of work)
• Uninstalling NVIDIA graphics driver (then the card is unusable, of course)
• Disabling Device Manager / Display Adapters / NVIDIA GeForce GTX 1080

I already contacted NVIDIA and the graphics driver is not the culprit. Something has gone wrong with the user profile as the same driver works just fine in a new profile (and there's nothing wrong with the driver anyway, it's just the Restart or Sign out process that has a problem).

What can I do to fix this? One useful thing would be to have a step-by-step procedure for the Sign out. So that it'd ask before continuing to the next step and list what it's doing. Or if I could just disable whatever it does when the error appears.