The process of downloading the Epson Perfection 640U Scanner TWAIN Driver 5.71A for Vista/Win7 driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the Epson Perfection 640U Scanner TWAIN Driver 5.71A for Vista/Win7 driver from the primary server - this is the manufacturer’s Epson official website). If the download still fails to run, check whether your anti-virus software is not blocking the connection to the manufacturer server of the Epson Perfection 640U Scanner TWAIN Driver 5.71A for Vista/Win7 diver.