The HP printer driver is unavailable error will not let you print the important documents. If you want to fix it, the first thing you need to do is Reinstall the printer drivers. There are chances that you are using the outdated drivers causing the error. If this solution does not help, check for the latest updates and install them on your device. Once you have installed the latest updates, you need to restart the system. Later on, you can resume the printing task. You can take professional advice to fix the issue.