I followed the instructions from a friend on my favorite sims forum. Here is what she told me to do:
Uninstall everything, but do it in reverse order (Ambitions, HELS, WA, Sims 3). Delete any folders and references left by going through MY COMPUTER. Run a scandisk, defrag and clean out your caches. Install Sims 3. Update. Install WA. Update. Install HELS. Update. Install Ambitions.