P5 is also memory intensive. Win98 has an upper limit on the memory it can address for a program, so all that extra memory over 128 meg goes to waste. P5 itself seems to have a memory leak, and combining that problems with the memory limitations of Win 98, you can have some real problems getting things done. I'm running over 700 meg of memory on an XP 1.1 ghz system. I can render 1 or two clothed high res figures (1 V3), after that it becomes too slow for anything useful. P5 will work on a Win 98 system, but it'll be very slow, and you'll hit the memory wall a lot sooner.