On the other hand, anyone who is NOT running Win XP or 2000, I would personally discourage from installing Poser 5, until they upgrade. I have one PC running Windows ME that runs everything I throw at it - including video editing, MIDI editing, and 3D games. It even runs Poser 4 like a champ. However, I could NOT get 5 to run on it. Even after patient technical support help from Curious Labs. Even after SR2 removed the Interlok support. As far as I am concerned (and I say this as an experienced PC multimedia programmer myself, with a series of Poser-compatible utilities under development - so I AM committed to Poser's success), Poser 5 is too fragile to run on any Windows OS prior to 2000.