I have pspx2 on a my new laptop (well, not so new anymore....but it was brand new when I put pspx2 on it)...so no old versions of psp on here... never had any problems. I'm running with Vista and it works beautifully. I love it.....it does everything I could ask it to. I upgraded from psp8.
I am self taught but took the PSP Intermediate class here at GDS taught by Daphne....her classes are really great, so if you want to learn more about this program I really recommend them.