TheCitrusDragon The saves crashing the game is a known issue:
Crashes on Mainmenu | EA Forums - 12139111
Some players report that adding back their mods and custom content helps, updated versions where necessary of course. In particular, one cause of the problem is a missing cc tattoo that a sim had previously used. I don't know whether that's your issue, but that would be the place to start.
It's also possible that some of your saves are fine, so try adding back one at a time to see whether it loads. The Main Menu displays the preview for your most-recently-played save, and the game will crash if it can't load the preview, but that has nothing to do with your other saves.
Another potential way around the issue is to create a new save; no need to spend much time on it. Save your progress, quit, and move your old saves from the old folder to the new one. Make sure to renumber the newest save, that you just created, if it conflicts with one of your older saves.
Try again to load the game, and if you can get to the Main Menu, use Load Game to select an older save and play it. If the save is fine, you can continue playing it and save your progress; it might work again.