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Question Laptop's weird

Mar 24, 2020
So few days ago I installed this... erm not legal version of a game on laptop from a shared online library. But it should not be a problem because 15 other guys used the same files and none had a problem . Anyway, while trying to access servers the game (CoD4) performed some small downloads (each server had some mods). Later on I noticed that the ping is now always crazy high in one other game and every time I close a full screen program - the desktop background picture disappears, and comes back only when I open "personalize" options. Malwarebytes scanned and quarantined some files it found strange (not sure when I got them), deleted all CoD4 files I could find and still this happens. Windows 10. Should I perform a system restore point (even though I didn't set any?)
If anyone has a slightest clue what happened I would be grateful