Windows 10: There is a plus sign with 4 corners that suddenly appeared on my monitor

When there's nothing on the screen it doesn't appear but when I put an appplication on that screen, that plus sign apppears. It was fine all along until yesterday after I updated my nvidia drivers and this appeared. I have already rolled back my driver update and it still appears. Not sure what's causing this. I can't move it. It overlays on whatever application I put on it. It doesn't appear when I try to screenshot and save the picture

:)

 

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.

 

plus (+) sign in phone number ?

I have a telephone list in Outlook with all numbers including country code with a plus(+)-sign in front of it.

When I use OVI Suit to synchronize with my phone 6720c the plus-sign disappear in the phone, so I can't use them?

 

Colored box in lower right hand corner of monitor

Suddenly, I have box in the lower right hand corner of my monitor with what appears to be emails. Does anyone know what it is and how to get rid of it. Very, very annoying.

Thanks for any help.