Operating System: Windows 95 (Note: might work with other versions of this os.)
Before downloading: Run Free Scan for Instant Driver Updates
The file for download is a self-extracting ZIP file. After you download the file please follow these steps: For "P" Series Scanners being used with Windows XP Download This Installation Guide or go to the help page.
Double-click the icon of the scanner driver file you downloaded and click on "Unzip".
The Driver will now be located in a folder with the name of the file you downloaded in you current directory (where you downloaded the file).
Open the driver folder and look for "Setup.exe". Double-click on "Setup.exe".
Scanner driver installation will be started automatically. Follow the instructions on screen to proceed.
For windows XP Installation Guide : http://www.benq.com/ss_download/drivers/imaging/installation/403_xp_install.pdf