The "Null Print" driver for the HP Photosmart 5520 Series refers to a basic, minimal print driver configuration that essentially disables the actual printing functionality. It's sometimes used for troubleshooting or when you want to prevent a printer from printing on a specific device (e.g., in a shared network scenario) or for testing purposes.

This is not a standard installation option you'd typically use unless you're dealing with a specific configuration or issue that requires it.

However, for most users, you'll want the full HP Photosmart 5520 driver to print and scan properly. Here's how to install the correct driver for the HP Photosmart 5520 Series printer on a Windows computer: