Dots randomly appear when open a new window

Sep 25, 2018
1
0
10
Hello,
since a few days I have this problem when i open a new window/software, it's random, with different problems:
- on most windows there are many small round dots, they look white or grey, i thin they're just too small:
https://drive.google.com/open?id=1589Qfb8aX7JvJy6qWg21qxLdKyOJXvUv
-sometimes when i open a new app (for example Firefox or the one on the pic), it shows bigger black or white, that look more a several pixels in rectangle shape.
https://drive.google.com/open?id=1hTH_EWAigmJEFSZlS4lCAwboYTQL-XYm

It displays the same way when i use the laptop screen or an external screen. If i reopen the window, the spots appear at different locations, in different numbers, sometimes more, sometimes less.

It seemed to appear when I updated the BIOS recently.

My laptop has Intel i7 and GeForce 745M. I tried to update the GPU drivers after the BIOS update, windows says they're up to date.

If you have some ideas please share, thanks !