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Drivers for CanoScan D646U-ex are available at Canon official support site
Click here and select the operating system you are using and download the drivers and scanning software. (You have to download the drivers according to your Operating System and installed them) Let me know if any clarification is required) GoodLuck! CreativeTECH
GO TO WWW.CANON.COM HOME PAGE THEN SELECT CONSUMER PRODUCTS.THAT SHOULD GO TO DOWNLOAD LIBRARY.GO TO PRODUCT MENU.1-SCANNERS,2-CANOSCAN SERIES,3-MODEL D646U THEN PRESS GO.THAT SHOULD TAKE YOU TO DRIVERS&DOWNLOADS.AND YOU SHOULD FIND ALL YOU NEED THERE. HOPE THIS HELPS YOU WITH ALL YOUR NEEDS. GOOD LUCK.