Windows 10: White Rectangle in top left corner - Windows 10

There is a small rectangular box at the top left corner of my screen. If I log in, I don't see the desktop items and only see this box in the corner. If I double click it though, my shortcuts and other items appear but the box stays in the background. It is kind of annoying and I think It might be a virus. I recently deleted everything and reinstalled windows but this keeps on happening. How do I fix this?

:)

 

White Rectangle

I had a white rectangle show up in the top left hand corner of my desktop. It was quite annoying. I tried changing the wallpaper, and killing a few programs in task manager. In the end I restarted windows explorer and that fixed it. Some people killed
other programs but those threads are locked. Hope it helped!

 

White box on the top right corner of the screen

So theres a werid rectangle thats like whitish in my top right hand corner of my monitor. You can't drag it. sometimes all my apps disappear but if you double click it (the rectangle) they come back. if i do Windows + Tab and switch monitors or create a
new one its still there. I have no idea why this is here, its always been here since i got my computer.

***Original title: Theres a werid top left box on my monitor***

 

white spot on lumia 550, top left

I get a white spot that comes and goes in top left corner of the screen. What is it ?