Re: HELP I moved my Sims 4 Mods folder to my desktop and now everything is gone.
Move your Sims 4 folder out onto your desktop, or rename it, and let the game generate a new one... You can find the folder in Documents > Electronic Arts > The Sims 4. If your game then works ok the problem was in your user data... Now you have a nice, new, clean user data folder you can try adding your old data back into the game gradually, testing after each addition. For example, copy your saves from your old The Sims 4 folder into the new one. If your game once again doesn't perform properly then you know that there is a problem somewhere in your saves, one or more may be corrupted.
That is quoted directly from step 1 in the link. Why do you have a new Sims 4 folder on the desktop? Maybe reading through several times will help.