PSE 10 is giving me a sudden new error message that I need to install a printer. This is already completed and I have printed in past w/o any problems. What is the problem now?
Sometimes resetting Photoshop's preferences will help, by removing the last used printer settings that are tripping up the current printer driver.
Sometimes you have to remove the printer driver, then reinstall it to reset the driver's preferences.
And sometimes all it takes is an updated driver from the printer maker.