Poser runs much better on NT based operating systems (NT/2000/XP), so you will b ehappy changing to 2000. The lousy memory handling in Win 98 cripples Poser. Jim Burton had a benchmark recently letting people compare render times in Poser 5, he did the same thing last year with Poser 4. It seems that Poser 4 is faster on AMD's but that Intels are faster on Poser 5. Anyway, the difference was not that huge in any case.