Canoscan D646u Ex Driver Software

Do you have the XP installation package? You can right-click on it and choose Properties. Pick compatibility and set it to Run with XP (SP3) compatibility. Then see if it installs.
Automatically Update CanoScan D646U ex Canon Scanner Drivers with Easy Driver Pro for Windows 7. CanoScan D646U driver download and installation. Python Template. Download this Canon Scanners device driver, then follow the procedure below. If you need help, let us know.
If it appears to install, test it to be sure. OR Do you have at least 2GB RAM, preferably 3GB+? Have you downloaded and installed - XP mode from Microsoft? If so then open a Virtual XP window and install your scanner there. You will have to scan in the Virtual environment but the files can then be saved to folders outside the virtual environment which can then be used by any program installed in W7. Do you have the XP installation package?
You can right-click on it and choose Properties. Pick compatibility and set it to Run with XP (SP3) compatibility. Corellaser Software Download. Then see if it installs. If it appears to install, test it to be sure. OR Do you have at least 2GB RAM, preferably 3GB+? Have you downloaded and installed - XP mode from Microsoft?
If so then open a Virtual XP window and install your scanner there. You will have to scan in the Virtual environment but the files can then be saved to folders outside the virtual environment which can then be used by any program installed in W7. Once you run the exe you need to locate where it expanded the files and you will need to set compatibility mode on all executables there and then run the appropriate files. As I said it MIGHT work. It was a long shot from the start. The truth is you are attempting to use hardware that is NOT supported since XP! You could try contacting Canon support and see if they have an alternate driver that may give you functionality (essentially what Draceena mentioned).