Sims 3 has stopped working

[jpbslg]

Hi Everyone!!!
I cannot play the Sims 3!! 
I have all the Expansions and complements disc. (im missing adventure island, is the one that i have to buy)
But I've been playing Sims 3 during the past months and yesterday the Sims 3 has stopped working

i don't know what to do!! 
Someone help me please!!! 

Im on a Win 8 32bits
4gb Ram

Core i3