Removing HP Printer Drivers

Various drivers are installed in /Library/Printers/. You can locate installed drivers in the PPD/Contents/Resources/ folder within that main folder.

Since I don't have HP printers I'm not sure what is installed. If all you find are files named for a printer model you don't use, then I would presume they can be removed. But since I cannot tell you definitively what's safe, I suggest you make a new folder on the Desktop and put what you would think to delete in there. If nothing bad happens then they are safe to delete. If there's a problem then you can return them to their proper folder.

As an alternative you could remove/uninstall all the HP stuff. Delete your printers in Print & Fax. Restart the computer then Add a printer. OS X should then download to your computer the printer driver software required for that printer. This is what it normally does if you install OS X with the option to just install for connected printers. When I've done this on my installations the driver for my Lexmark printer is installed and the printer automatically added. Same for my Epson scanner.