What is this effect when the window is not redrawn?

Question

Skype

I'm trying to get Skype to work normally on an old PC. It works, but with prolonged use, it starts to render windows incorrectly. I don’t know what this effect is called, but you can draw an analogy with when Windows 98 freezes, then if you move the window around the desktop, its mark remains on the wallpaper.
In Skype, the effect is similar to this, when I expand the window on the desktop, I see a frame with a slave wallpaper. tables inside. When I move the mouse over the elements, they are drawn, but only these dynamic elements, the rest remains as it was with the background of what was in the video buffer before opening Skype.
Please throw a link to a description of this effect, or at least a name in English, so that I can delve further into the search.
PS If someone had problems with Skype on xp (bsod popped up when calling) and so on, please unsubscribe how you solved this problem.

Answer 1

The name of this effect will not tell you anything. It's just that the developers have long ago scored on XP and write without its support. They can do anything, they can stop running altogether, no one promises you work on ancient systems.
It's just that the previous buffer is not cleared, but drawn on top of it, that's the whole effect. You won't be able to solve it. Maybe just by chance, update the firewood on the video, put all the latest service packs, but I doubt that this will help.