Everytime I click on the play button in the Sims 3 launcher it goes to a black screen with a loading cursor,acting like its going to load but it doesn't. The screen will just stay like that. I've tried to start the game from Origin but the same problem. I only have the base game installed along with Late Night, Generations, and Showtime installed in the way they were released. I have a lot of Custom Content but I'm sure that isn't the problem because this is the first time this has ever happened to me. The problem started right after the sound on my computer stopped working and I updated the driver software for it.
Try the factory reset described in this post: http://answers.ea.com/t5/The-Sims-3/FAQ-Troubleshooting-Steps/td-p/714/
If that doesn't help
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@chelseathepug no, your content will not be deleted if you follow the steps correctly. If you backup them up, they will not be deleted.
Follow the steps in the thread linked by Crinrict above