Printer drivers are located in the Extensions folder inside your Macintosh's System Folder. If you're having printing problems, check the Extensions folder to be sure a printer driver for your printer exists.
If a printer driver exists, check the Chooser to be sure your printer is selected. If printing problems still occur, you should consider contacting your printer's manufacturer for information about their printer driver software for your printer.
If a printer driver doesn't exist, you probably need to reinstall a printer driver.
You'll find more information about setting up your printer with your computer in the documentation for your computer and printer.