try the reset all sims cheat
ctrl+shift+c hold all 3 together in the menu bar that appears at the top of the screen type in resetsim * (inculding the * hit enter ) this will reset all sims inculdeing your own make sure your own aren't doing anything important cancel their acton q
then if they can interact save the game with save as give the save a new name then save and quit clear the cache files
to delete the cach files go to electronic arts/the sims 3/
•CasPartCache.package
•compositorCache.package
•scriptCache.package
•simCompositorCache.package
•socialCache.package.package
it's safe to delete these files as a new ones will regenerate
