we must look at the central rail guiding carriage scanning, mine is not secure, a loose screw and the scanner becomes very noisy giving the impression that it rubs somewhere, then the trolley stops refusing to scan a full A4 page or interpelant the end of the page that becomes wavy, it is side hinged rail detached from its base, which explains both the noise and blockages, GUI, recycles Canon Scanner Control GUI using the same programs as those sold with multifunction ink jet printers, nothing to do with the practicality of my past scanner 8400 that gun does not leave work under Win 7 64-bit or 8, a priori the sole interest of this scanner is the self-powered harbor USB allows autonomy to use in the library or elsewhere even without plug by feeding it with the laptop, and very low sounds weight it off again today from Amazon for a refund, I hope my Future same canon scanner will be mounted seriously, so that it is at least usable
