generic postscript printer

I need a generic postscript printer driver for W7. I've always used the basic Apple printer under older versions of Windows and never needed to.
We have been told that we need to install a generic postscript driver for Windows 7 (64 bit). I am after some advice on what driver to install and  Installing Generic Color Postscript Printer Driver.
Now I want to use the printer on my new Macbook pro. The printer is recognized as USB- printer, but I'm not able to select ' Generic postscript   CUPS vs Generic Postscript.
Mobile deployment and imaging. You are using an out of date browser. Supporting Vendor-Defined Paper Sizes. Now I see them. Command String Argument Types. generic postscript printer