Renstalling Game Folders

I know I have read this somewhere but I can't find it anywhere. I've just uninstalled everything and reinstalled it due to severe problems with Seasons and I tried to play the game with none of my saved games first before putting stuff back on (it seemed to work OK). I then installed my download folder and neighbourhood folder (to see what would happen) and I got my custom neighbourhood's welcome screen actually working (which it never has). So I then decided I should put the rest of my saved folders in (bearing in mind I had 20 saved ones and only 16 (excluding Downloads) in the newly installed game. I basically copied the whole folder back in and started getting issues (and the neighbourhood start-up screen wasn't working again).

So, I have taken everything out again and run the game to put the folders back in. Can someone tell me which game folders to put it please? I know downloads and neighbourhood folders (obviously) but which others?

I forgot to say also, even though I disable the start-up custom content opening screen in the options, it still shows up everytime I start the game

Thanks