Mine hangs a teensy bit on XP, I've found XP will take its time with some things, but it does seem to use all the memory. It is much faster on the startup, but takes Forever to Find anything! Biggest challenge yet-- Greg hair. Every puter has gulped before using it, but then goes ahead and does it. And, if I don't save the pz3 file first-- this is when starting up a new file, XP thinks there's not enough room to render-- I not sure where it thinks it is-- the C partition or the D partition where Poser is, or even the shared files folder. Emily