Windows 10: windows 10 black screen and white squares

I started up my computer and it crashed after the login in screen. since then i havent been able to get it to load windows correctly. i was once able to load into a screen that gave me diagnostics options but that was unable to help. it then restarted to a black screen with flashing white squares. windows support was useless and i havent been able to fix the issue

:)

 

Small white square on screen

I have recently noticed a small white square on the bottom right of my laptop screen. I have absolutely no idea what that is or how to take it off. Here is a print screen.





This little white square is not on the top of everything on the screen. If, say, I click on the notifications button, we do not see the square





Any idea of what that is? Or how to get rid of it?

If it is relevant, on the tray I have:

• CCleaner
  
• Acer Care Center
  
• GeForce 920M
  
• Avast
  
• NVidia GeForce Experience
  
• Avast SecureLine
  
• Drive File Stream
  

My computer is an Acer Aspire E15 with Windows 10, 64 bits.

 

Black screen with white flashing squares

My computer keeps crashing-it shows a black screen with white flashing squares then restarts. This started today and happened six times already. I hard reset my computer but it still crashes. I have no idea what’s going on and I can’t afford to have someone
look at it. It is a HP 15.6” Touchscreen Laptop (Intel Core i5-8265U/1 TB HDD/8GB RAM/Windows 10). I’ve attached a picture.

 

White square on lock screen

Hi, I have a minor problem that I'd like to be fixed. Whenever I put my laptop to sleep for a long time by closing the lid, then opening the lid to wake it up. I get this big white distorted square as my mouse cursor and it goes away when I drag up the
picture screen when you wake up a windows 10 computer, to type in my password to get into my account. What can I do to rid of that white square?