HPZipm12.exe (Hewlett-Packard): HP PML Driver Service.
"Background task installed by the drivers for a variety of HP printers, this task handles non‑printing related two-way communications between the PC and the HP printer. Typically, on DeskJet and InkJet printers it will handle status-type communications such as ink levels, paper‑empty conditions, etc..., and will feed that information back to an HP icon in the System Tray."
"Because of its role as, effectively, a printer status information gathering task, this task should be left running since, without it, you will not get useful information from the System Tray HP icon for your printer which will think the printer is disconnected. If you experience problems with this task, first ensure that your firewall allows this task to communicate."
"Next, if you still have problems, see on our Drivers page if there are newer drivers for your printers which might correct the problem. If problems still remain after the above then disable this task on the Startups tab. Then locate it on the Services tab and set to Disabled."
From
http://www.answersthatwork.com/Tasklist_pages/tasklist_h.htm
For Driver information, see the referenced site.
HP all-in ones puts more processes on a system than any other peripheral I've ever had! I shut them all down other than what I need for the 3 functions. I don't need information gathering to call home to HP and tell them how much ink I've used! One of their processes reports to a Unix system in San Diego! Even HP couldn't' tell me what that was about!