You'll want to make sure that you use either Windows 95 or Windows 98. That way, you don't give your money to the "evil empire" by purchasing the over-priced Windows XP. Then, you can join in on the fun by complaining that Poser 5 doesn't work well with Windows 98. After all, Windows 98 is only 5 years old. Five-year olds are cute. You don't want one of those "just-made" OS's. No, sir, get an OS that has stood the test of time. Better yet, just go with DOS and free up all that memory that is normally used by the Windows user-interface. This was meant as sarcasm.