I am yet to be sold on Firefly rendering. Yes, it has great advantages over the P4 render engine in many respects, but the problems I have encountered makes P6 Firefly a poor cousin to the quick and easy P4 render. Not wishing to offend anybody, IMO I see little advantsge in 6+ hours of Firefly rendering over a 5-10 minuite P4 render. AO lighting is excellent in small scenes, but once you start adding several figures and many props, the advantages are outweighed by system hangs and inordinant render times. If the option is a full Windows re-install, I say fuckit, is it really worth it?