Hi jeff, thanks for your post, i try this several times but a windows keep appears write unable to open twain source please check connection then re-start toolbox. i try to add the path which is ;c:windowstwain_32cnql252 after c:program filestrend microamsp. 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.. Canon scanner – unable to open twain source. unable to open twain source please check connection then re-start toolbox. the problem is that the twain drivers are not within the system variables path. what i do first is open the control panel. next i click system and security..
Unable to open twain source. windows scanner and camera properties (c:program fileswindows photo viewer) shows the scanner (canon 8400f). i ran diagnostics and scanner executes successfully. you can hear the scanner initialize on power up but when running canoscan toolbox 4.9 (for windows 7), this is the answer. windows fax and. I am using a canon scanner (canoscan lide 60). it has been working fine but it stopped working today with error message: unable to open twain source here is. Discus and support unable to open twain source in windows 10 drivers and hardware to solve the problem; canoscan lide60 yes its old but you can still buy them new. its been working well on my new dell xps8700 running windows 10 for over 6 months..
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