HP has two or more different types of drivers available for most of their printers. In most cases on their web site, www.hp.com, you can find a PCL 6 driver, a PCL 5 driver and, in some cases, a Postscript (PS) driver. Some of our customers have reported strange glitches with the PCL6 driver (glyphs that are rotated wrong, or garbage characters printed on wheels or transit reports). These bugs are fixed by installing the PCL5 driver instead, which is apparently more compatible with all Windows programs. No problems have been reported with the Postscript driver either. Be careful to read the installation instructions for the HP drivers, because it's not a very user-friendly process. You must download the file, and then run the program that extracts it to a folder on your hard drive. Then, you must browse to that folder and run the setup icon to install the driver.