I have XP and Pro Pack. It works real fine for me. I would try some things: 1. If you have normal Poser delete all the .rsr files in the geometries folder. 2. Increase the size of your swap file. 3. Defragment your drive. 4. Search for other new drivers (Motherbord, Mouse, ...) 2. Uninstall Poser, Reboot, Install Poser. I'm never comfortable with a preinstalled OS. If you have a real WinXP CD (not a "Recovery CD") scrub you HD and install XP new (preferable with the newest drivers and not those 'old' from your vendor.