@LaLadyPanda The screenshots are very helpful here: it turns out you have multiple copies of your saves (or at least one of them), and multiple copies of the game's program files. I would strongly suggest cleaning up the latter before trying to get the game to work again. But before doing anything else, back up your saves.
I don't know what is in each saves folder, so it's best to preserve everything and go through it later, only deleting potential duplicates when you're sure you have the data you want to use. Create a folder on your desktop called "Backup saves." For each of the saves folders listed in your second screenshot, first put a number on the end of the folder name (saves 1, saves 2, etc.), then move that folder into "Backup saves." You'll probably have identical copies of some saves, but like I said, better that than the alternative.
Do the same for the Tray and Mods folders that are in the same location as your saves. If any folder is empty (or in the case of Mods, only has a Resource.cfg file), go ahead and delete it.
Once you've done that, download Revo Uninstaller (the free version is fine) and use it to uninstall Sims 4, and the EA App for good measure. If any of the Sims 4 folders in your second or third screenshots are still present when you're done, delete them and empty the trash. For reference, the simsx back up folder on your Desktop and the other Sims4 folder in Documents > Electronic Arts both contain duplicates of at least some of the game's program files, and this can confuse the EA App now and if you buy any new packs in the future. So they both need to go.
When you've done this, use Everything to search for TS4_x64. You should find zero results, but if any copies are left, and they're nested somewhere within a "The Sims 4" folder, delete that entire Sims 4 folder too.
Finally, reinstall the EA App and then Sims 4. For the game, please either use the default install location:
C:\Program Files\EA Games\The Sims 4
or create a new folder into which you'll install the game. Your current install is inside Program Files\Electronic Arts, which is actually the folder that holds the EA App's program files, and it's best to keep those separate from the game files.
Start the game once and confirm that your packs are all loading properly. If they are, you can move one or two saves to the new Sims 4 folder in Documents > Electronic Arts, and try to load those too. Let me know how it goes.
