It's not really clear what "my games files background etc." are, not what "a few month back in time" is for those. Files, for example, don't change when you replace the motherboard, since they are safely stored on the hard disk.
Although it shouldn't change the appearance and looks and contents of anything, the functioning of Windows might need a fresh install. Did you do that?
Now it’s like I went back in time a few months in my games files background etc and I have no clue what to do

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