Sims 3 freezes after 30 minutes?

So before I get into this, I have a windows 7, Lenovo 2.0, and intel inside core i5. I probably sound like a dumba*s because I don't much about computers but that's what my computer says. Anyways before I even get into the gameplay it takes 10 minutes on the loading screen that says "to discontinue this experience opt. Out of it in the options" or something like that and I don't know how to opt out of it because I looked through the options 3 times so could someone help me with that? Also after about 30 minutes of gameplay a popup says Sims 3 is using high memory usage and that means if I don't get off that second my Sims 3 doesn't save and it freezes. I tried taking the game out of full screen but it doesn't do any help. Any tips for these situation and if you could make them simple that would be very much appreciated because I'm not that good with computers. Thanks!

Added (1). I don't have money to buy a new laptop/computer and I don't have any other laptop/computer that I can use.

Had the same prob and then i changed laptops n it never freezes or crashes