Regarding installing 2 or more printers (ps and plain versions) in MS Windows, I just recently found out a few things.
(The systems are installed through VMWare on a Mac Pro Tower).
Windows 7 seems to work fine. The drivers overwrite one another, when adding a ps version or a plain version, etc.
(This would not be any kind of issue if only adding one printer. All must be done through the downloaded HP Setup/install software, unless going through printer properties and Advanced>Windows update, which in some cases can be done. Just trying to use the color center paper presets profiling does not work in the utility for printers found by windows itself, they must be upgraded (YMMV). One type of printer driver, ps versus PLC installs over the other via a driver software "overwrite". Then they both work.
Windows 8.1 Pro works fine with two different Z Series printers, but a few problems:
There appears NOT to be a ps version driver that works in 8.1 Pro. My workaround was to install all Windows 7 64 bit drivers via the above described method, and they work perfectly. I installed the printers by opening the Z3200ps driver first, allowing it to find and install the 44" Z3200ps first. Next, I Installed the Z3200 24" through the same driver , choosing the printer. Since Windows would not allow me to overwrite the driver file because a more recent version exists on the computer, I went to the newly installed printer (in printers) right clicked and went to properties, advanced, updated driver using Windows update, which installed the correct driver for the 24" Z3200.
Both printers could be seen and operated fully in Color center, excepting, of course, Job Queue on the 24" which I guess never works for the 24" model. (If it does, please, someone tell me).
So both Windows 7 and Windows 8.1 Pro allow fully functioning Z Series printers to work on their systems, if using Windows 7 64 bit drivers, and can be "stacked".
That has been my experience, now.
Trying to determine which system to really go for now, however. In planning to install several programs, I have to choose one or the other. I'm inclined to play it safe and stick with Windows 7, but Windows 8.1 Pro seems to work fine, and perhaps in the long run I'd be ahead.
It would be nice to hear any opinions about using the two systems, and preferences.
-Mark