I understand that one of the members wish to unstall PTE on a Mac. He has to run a recent Mac with DualCore capabilities. Use BootCamp (standard with system X.5) to create a Windows partition. Then install Windows XP or Vista (I was told XP runs smoother than Vista). Then download PTE (either running your Mac or your Windows system). Install it on the Windows partition. Alternatively you can use "Parallels" to run both sytems, which implies buying "Parallels". I have no experience of this last procedure. In both cases you should buy a Windows operating system as XP or Vista.