I didn't make it!
So... you know that message you get when you try to play the game after installing an expansion pack? The one that says something to the effect of, "The Sims has to update because you installed an expansion pack"? Well, I got that message, clicked "Okay", and then it asked me if I wanted to "Uninstall the Sims Unleashed". Of course, I clicked cancel. So, any way to actually let me play my game again?
(For your info; I have Livin' Large, House Party, Vacation, and Unleashed)