Ok, I give up...

Re-installing the game didn't work. So therefore it's either Bon Voyage, Pleasantview (only happened with Pleasantview, but I haven't played much outside of that) or my graphics card. I'm going to try playing it without Bon Voyage to see if it still happens. If it doesn't, we know it's BV that's messing up, if it does, I'll use a different neighbourhood for a period of time to see if it's Pleasantview that's messed up. If it continues to crash, then it's my graphics card that has the fault. Then I'll have to buy a new one or something.