Vista would not let me load Poser 6.....even in compatability.....I tried at least 5 or 6 times to load it....Vista was already loaded onto the puter...Vista also froze up several times for no reason.. and I had called tech support at Acer and they were the ones who told me also to load it over Vista....anyway took it back....no problems now....I have a new puter with XP on it (a better one than I previously purchased) :-)