While using printer you can see "Printer driver is unavailable" error. That means driver installed against your printer is either not compatible or is outdated. If your printer driver is outdated or unavailable then you can download driver with the use of 123.hp.com/setup. This is the manufacturer site of HP printer driver. Through this when you install new drive that is safe and original. For install any new driver firstly uninstall the old printer driver, then reinstalling the latest driver manually. After installing printer driver, you can solve printer driver is unavailable issue easily. Apart from this, if you still face any issue while using HP printer then you can call HP support team for your assistance.