You are missing a printer driver, download it from HP support site:
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?cc=us&dlc=en&lc=en&product=59867&
Edit: looks like you get your driver from window update, do a window update. Type "windows update" without qoutes into the start search box and select "windows update". On the lift hand side, click "check for updates".