The driver helps the computer to communicate with your printer. To install your HP Envy 5055, you will need to download the drivers from the HP Support website. Visit 123.hp.com/setup, scroll down the webpage, click Download Drivers. Now enter your printer model, aka HP Envy 5055, click the Submit button. Follow the instructions and download the driver on your PC. Make sure to get the complete package, including software and HP Printer assistant. Now on your computer, go to the download location, double-click printer installer files, and keep following the instructions to install HP Envy 5055 to your computer. During the process, you will have to connect and disconnect the USB cable by following the screen instructions. Now you can use your printer error-free. Keep updating the drivers at regular intervals.