The canoscan toolbox 4.9 is in the program (x86) folder). this is the same as the other windows 7 machine. the other machine did not need the path variable and it works just fine.. To install the twain driver: verify that the scanner appears in device manager (start - settings - control panel - double-click "system") select "hardware" select "device manager". the scanner is located under "other devices" double-click "canoscan"..... Canonscan twain source not found annavi apr 29, 2014, 6:48 am i am on windows 7 and i am trying to use an older canoscan n67ou scanner .i have downloaded the toolbox 4.9 version and the.
C:windowstwain_32cnq4803. now, follow these instructions to get to the dialog to modify the path environment variable. control panel > system > and then choose advanced system settings in the left hand column.. It worked before but when i connect usb on windows 7 and open canoscan toolbox (or press the scan button on the scanner which opens the same software) it keeps telling me that its unable to acquire twain source.. Click toolbox in the taskbar to bring the ui to the front of the screen. confirm the display. 4.when opening toolbox using aero view and larger scale setting, the ui may not be displayed properly..