The Printer Driver that is in Windows Update does function, but is not complete. The form size oly goes up to 11 X 17". And when you make a custom form size, it either does not show up or it is not valid. Also, the printer prints up to 1200 dpi. The print driver only recognizes 600 DPI. I have been using this printer for several years with Windows XP. I make Poly Plates with it for Offset Printing. Mostly I take an 11 X 17" Document and Print it on an Oversize Sheet 12 X 18.5". It is centered on the plate. If I run the 12 X 18.5 plate through in Windows 7 and go with the max size 11 X 17, it is too far off to one side. Also the Print Quality is not good enough at 600 DPI. I really need a better Printer Driver. The HP Universal Print Drivers for Windows 7, 64 bit don't work at all. Please Help.