You can't run WordPerfect in the current Mac OS. So you have two choices. You can install Windows on your Mac and use Windows (either boot into it using BootCamp or run something like Parallels or VMWare Fusion) when you want to run WordPerfect, or you can find a (free) program that will open WordPerfect files in (Snow) Leopard and gradually tranfer them to a Mac-friendly form-- many people recommend OpenOffice, but it didn't work for me. NeoOffice does, however. So I have all my old WP files on my Mac, and as I need them, I open them with NeoOffice, and then save them into Word format. I decided against running Windows on my Mac, so I can't tell you how things work if you use Parallels or Fusion-- maybe someone else can.