Re: If I uninstall the base sims 3 game, will I lose my expansions?
@Norinia If you reinstall entirely through Origin, you won't be able to add any game that's not in your Origin library. I'm not quite sure what you're saying, though. Do you have none of the discs at all? In that case, you'd have no way to reinstall any pack that wasn't registered to your account.
If you do have disc copies of the packs that aren't in Origin, that might be a different story. I'm actually not completely sure what would happen if you installed those packs via disc and the rest via Origin. (I know it used to work fine, at least most of the time, but things may have changed since you originally installed.) It's a risk though; if I were in your position, I'd try to borrow someone else's computer for an hour or so and test it out.
Before you consider uninstalling, though, try a clean game folder. Pull your entire TS3 folder out of Documents\EA and onto your desktop, and a new one will spawn the next time you launch the game. Start a new save and play for a bit, testing live mode, CAS, and Edit Town to see whether it crashes. If not, you can copy one of your saves into the new folder from the old one and test again.
Your NRaas mods are probably not the source of your crashes, although there are some reasons they'd now cause issues. One is if your game was never fully patched until now—adding the new stuff pack would have brought your game to 1.69. But at any rate, the clean folder won't have any mods. If the vanilla game runs fine, you can add some mods into the new game folder and test before copying over your save.