Re: My Sims3 folder is 40gb is that too much ?

40 GB is massive.

How big are your saves ?

Sims 3 is only a 32 bit application so it cant' use more than 4 GB of your Ram before you get Error 12. To me it sounds your save has gotten too big.

Are you using custom content ? Did you try remove some of the saves you don't need (like move them to the dektop)