Your personal library or the stuff uploaded to the gallery (which should not be affected by reinstalling your system.
If you didn't backup your user files though, it's possible that the Sims from the library are gone.
Do you have your other user files like your save games or possible custom content ?
I have nothing its like a brand new game all of the expansions and stuff packs redownloaded but when I started the game , it started like the very first time and had me make a new sim before I could go to my neighborhoods. I don't know just really disappointed now because I lost all my sims and progress.
I figured that if I uploaded my stuff they wouldn't be effected but now I see I probably was wrong .
Sounds like your user folder got reset.
Do you still have any save games in this folder: documents\electronicarts\thesims\sims4\saves or any in the folder tray ?
If not, try searching your hard drive for TRAY to see if there's another tray folder somewhere.
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