you can: - create a new partition and install XP there (you could also install on the same partition as Win98, I know it's possible (cos I had it) but I don't know how to, and anyway i strongly advice against it) - then as DaleB mentioned you'd get a boot choice screen. - from XP you can start whatever Poser 4 exe you have on your disks (as long as the partition is visibile from XP) - you can NOT start P5 unless it was installed on XP - differently from P4, P5 checks if it was isntalled in the registry - I strongly recommend to give up XP and go for Win2000 instead. I am extremely unhappy of XP and extremely happy with Win2000