Did this happen after a Windows Update?
Have you tried using the HP Support Assistant? Its Tune-up application should be able to identify any missing drivers and give you the abilityy to reinstall them.
Follow the instructions on the following HP web document link.
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=c03430118
