Upgrade the OS? Surely you jest! I myself am a big DOS gamer, so Win98 is the last good OS, note that I make no mention of WinME... oh crap, I just did. However, for those that don't like XP much, like myself, Win2k is quite stable once all the patches are installed, and I'm quite happy with how my computer works, with having a Win98 and Win2k dual boot setup. I can happily play around with Poser on Win2k, and if the need arises for a game of "Sam & Max Hit the Road" or "Day of the Tentacle," bam! there's Win98 just waiting to go to DOS. :D

 

Currently using Poser Pro 2012 (Display Units = feet)

AMD Phenom II 3.2ghz (6 cores)

8gb RAM

Windows 10 Pro 64bit