http://zophra.com/a-troubleshooting-guide-to-fix-the-hp-scanning-issues You can fixed your HP scanner by following some of the very simple steps. I am sure it will help you to fixed your HP related issues instantly.
Open HP Print and Scan Doctor, click Start, and then choose your printer. In case it is not listed, turn it on and click Retry. If there is a connection problem, follow the instructions in the tool.