HP Scanjets - Scanner software installation fails

Step one: Turn Off Antivirus Program

Step two: Uninstall HP software

Uninstall all HP software associated with the Scanjet in question.

1. Disconnect the USB cable from the product. For scanners on a network, skip this step.
2. Uninstall all HP programs associated with the device.
   1. Check whether any of the following programs are listed:
      • HP Imaging Device Functions
      • HP Photosmart Essential
      • HP Scanjet (with product name and software version number)
      • HP Solution Center
      • HP Update
      • HP OCR Software
      • OCR Software by I.R.I.S
   2. For each program listed, click the program name and then click Uninstall .
3. Wait while the computer reboots.

   NOTE:

   Uninstalling HP Photosmart Essentials and/or HP Solution Center will force the system to reboot. If for some reason a reboot does not occur automatically, restart the computer before continuing.

Step three: Remove the Hewlett-Packard directory or key from the registry

1. Open the registry folder HKEY_LOCAL_MACHINE, open SOFTWARE, and then locate the Hewlett-Packard folder.
2. Export the HKEY_LOCAL_MACHINE\SOFTWARE\Hewlett-Packard directory to a safe location, and then remove it from registry.
3. Reboot the computer.

Step four: Install the HP scanner software and driver

1. Insert the CD that came with the product or install using the downloaded software and driver.
2. Follow the onscreen wizard prompts to complete the installation.

Step five: Re-enable AntiVirus Program

Source:

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=130&prodSeriesId=3884438&prodTypeId=15179&objectID=c03132079