mycailin Try installing the world into a clean user folder. If it works, and you don't have a lot of Store content, you can install your other items into that folder and transfer over your saves and other content, leaving behind whatever the issue is in the old folder. The process is described here:
[Read First] Sims 3 Store guide | EA Forums - 11157679
If ST installs into the clean folder, but reinstalling your other Store items would be a burden, let me know. There's a way to work around the issue that's a bit tedious but is faster than reinstalling the entire Store.
