no paint will stop mold from growing on it alone, you need other measures, environment being the obvious preventive measure. use kilz primer with a half cup of lysol disinfectant per gallon of paint and mix well, that works good. but me personaly, if im using painted walls, i repaint after every 3-4 crops anyways
when building my room, i went to Kelly Moore for paint. They gave me a few packets of some anti-mildew additive for the paint. Check em out...here in SF this type of additive is crucial, with the fog and all...