I'm finally upgrading my PC. Anything I find prebuilt comes with windows XP. 1. Is there any issues using Poser 4 on XP? 2. Is there any issues if I upgrade to P5 with XP? 3. Recomended memory size? I know that issues sometimes are machine/user specific, but I'm looking for trends in issues that people have had. I may just buy the computer and shelve XP for W98se.