I am completely dumbfounded! I upgraded to Windows 7 64bit, and read all of the threads about reinstalling the Z3100. I have the Z3100ps GP 24", hooked up through the ethernet connection. My printer did not appear in Devices & Printers, and the Printer Utility could not find any Designjets. I uninstalled all the HP software, and managed to get HP-APS up and running by finding the registry key from XP and installing it in Win7 as shown in this and other threads.
I got HP-APS to recognize my i1Display2, but it would not find the printer (even prior to my uninstalling the software.)
I downloaded and tried to install the Vista 64 raster driver, but kept ending up with the message "driver installation failed." I tried it from the other end, Add New Printer. The install program was able to see my Z3100, but the installation of the driver failed the same way.
I am able to address my printer through the 192.168.0.x address in my browser, verifying that Win7 64bit is compatible with my router. I can get reports of ink levels, change the printer default settings, etc. But I still can't install the printer!
Maybe I'm missing something, but for those of you who succeeded, what I need is a detailed set of steps to follow. I really need to get at the printer soon.
What sounded promising was finding this folder: C:\Program Files(X86)\HPDesignjetZ3100psPhotoseries\drivers\64bit-xp-s2003-vista\PCL3winxp-64, but I don't know what to do with it, what to do before getting there, and what to do after.
I am so angry at HP for not having a Win7 64-bit driver until June! For me, shelling out the $4500 bucks for the printer was an investment I would not have made if I knew that HP, some 3 years later, would call this printer a "legacy" printer and not upgrade the drivers even before Win7 hit the newsstands!