What worked for me was going into program files and coppying the launcher autorun thingy to the desktop.
@liviones The usual suggestion is to go into Documents\Electronic Arts and move the entire Sims 3 folder to your desktop. That would allow the game to create a new folder (without any of the potentially corrupt files from the previous folder), that is, if the game opens at all.
If this doesn't help, have you ever had two EA/Origin accounts merged?
The same thing happened to me today, I've never had any problems with the sims, and i actually had two of my accounts merged today, so that should explain why sims 3 doesn't launch. Anyway I've spoken with customer support and hopefully they'll help me tomorrow. But I wanted to play so bad haha it's been years since last time i played.
