The same thing happens to me. It played just fine yesterday morning and now, nothing. Launcher works, and it gets to about 89% loaded, then crashes.
@abc415232430 I split your comment into its own thread because it's easier to keep troubleshooting to one thread per person.
The first thing to try is dragging your entire Sims 3 game folder out of Documents\Electronic Arts and onto your desktop. Launch the game again and try to load a new save. Let me know whether it works.
If you can't load the game even in a clean folder, please run a dxdiag and attach the results to a post here.