Re: Corrupted files
@jeanmarie618 Your computer can actually handle running all Sims 3 packs together on ultra graphics settings, although water and high-detail lots should be turned down to lower the stress on the game engine. (I play with those on "mirrors only" and 2, respectively.) Your processor wouldn't be under any undue stress unless it's overheating while you play, and your hard drive should be completely fine too. You also have enough RAM to support Sims 3, which can only use 4 GB, although it's a good idea to not run too much else while you're playing. The warning about not running with all packs is a bit overboard and totally generic—everyone playing through Origin sees it—and doesn't apply to your system.
The only component in danger, so to speak, is the graphics card, and that would be from running Sims 3 at excessively high framerates. It's not that the card can't handle the load of the game, it's that generating extremely high fps isn't good for GPUs in general. And turning down the graphics settings or disabling certain expansions will actually raise framerates: since the game becomes easier to render, the graphics card is now capable of rendering more frames per second than it could before. This is why it's critical to manually cap fps; if you haven't done so and want help with the process, please ask, and let me know whether you ever play in windowed mode.
By the way, World Adventures is one of the lowest-impact expansions, so adding it wouldn't have much of an effect on how your or almost any system handles the game. Pets is the most demanding EP, but like I said, you should be able to run it.
I'm not sure whether you've done this, but don't ever disable an expansion and then load a save that has been played with that pack active. That will definitely corrupt your save even if you do everything else right.
NRaas mods help Sims 3 run better, but most of their impact has to do with keeping saves from getting corrupted. The effects can include lowering the amount of RAM a save uses in that errors get handled before the game engine falls all over itself trying to resolve the problem, but the mods don't do a whole lot to help borderline systems. However, since your system is far from borderline, the issues you're seeing are almost certainly about your saves and not your hardware.