Hey There, I am Sofia Carter. One of the possible causes of the 'hp printer driver is unavailable' problem is an out-of-date system. As a result, it is suggested that you apply any available Windows updates to resolve the problem. Here is how to install the necessary drivers. To begin, go to Start and enter "update" followed by Check for updates. If updates are provided, Windows will start installing them. Restart your computer after Windows has finished upgrading.