You may have to re-boot your computer at this point. This will create a Printer called 'Generic PostScript Printer'. Make sure you set your default page size when the Properties window appears. It can be downloaded from Adobe's download site and will automatically detect your version of Windows and install the appropriate files. There is a copy of the Adobe Postscript Driver on the PM7 application CD, but I strongly recommend that you install the latest version, which is 5.2, and uses the Universal PostScript Windows Driver Installer 1.0.6. Note: You don't need to have a Postscript Printer actually attached to your computer, you just need to have the Adobe Postscript Printer Driver installed.
Here's an extreact from how to install the PS Driver for windows, but note it's Win2K - because PM is now obsolete. The PS Driver is now part of the standard WinXP installation.
The answer is it depends on your platform (I'll assume Wndows) and your version of it.
