Windows 10: Black blank box approx 4 x 5 lower right corner of monitor screen

Does anyone know what is causing a black box to appear in the lower right corner of my screen and how to get rid of it?

:)

 

I keep getting a blank white box in the lower right hand corner of the computer

I keep getting a blank white box in the lower right hand corner of the computer screen

 

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.

 

Black border around monitor

I tried the steps you suggested and it did not change anything regarding the black border. I am trying to come up with a better explanation, the information on my screen has a black frame around the information on my screen. The display does not go from
corner to corner of my display monitor. There is a 1 inch thick black bar on the left and right sides and a 1/2 inch thick black bar on the top and bottom. I attached the screen shot per your request but it is only showing the information on the screen up
to the black frame. I can get rid of the black frame by going to a lower resolution but I didn't think that is the right solution. I should be able to upgrade to windows 10 and still have the recommended resolution for my monitor.