Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
That is a sign that you need to do these three steps, in extreme summary:
1. turn off the printer, disconnect the USB cable, select the printer on your computer, and delete your computer (-this procedure varies from Windows PCs to Apple computers. But that's essentially what you need to do.)
2. restart your computer.
3. download the appropriate driver for your computer O.S. version, and appropriate for your printer model, and install it anew - only connecting the printer when either the installer requires you to do so, or when the installer has finished running and exited.
For details, please let me know what Windows (or MAC OS X, if Apple...) version is on your computer, and I will spell out the steps in more detail.