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I have a Canon scanner 5000f. All of a sudden the computer won't recognize it and says it is "unable to select Twain Source." What do I do?

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To select Twain Source, firstly make sure TWAIN devices are available. Here's a related article about TWAIN scanning. Twain Scanning in Web Document Viewer

Posted on Dec 29, 2014

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Windows will not let me delete the files. Now what??

Posted on Sep 04, 2009

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First you need to follow the instructions for installing the scanner. It is important whether you connect the scanner before the software is installed and whether you work from the new hardware found box or just install the driver as software. It sometimes varies between operating systems as well.

Sometimes the twain files can become corrupted. Since other devices like digital cameras use the twain files they aren’t erased with a driver uninstall or overwritten with an install. If the twain files are gone the driver install will also install them.

Uninstall ScanGear (I think that is the Canon driver software) and remove the scanner if it is still showing in device manager and control panel under scanners. Unplug the USB.
Do a search for twain and delete all you find in the Windows folder. There is probably a folder and several files – delete them all. Do not remove any twain files not in the Windows folder.
Dig out the instructions and reinstall the scanner exactly according to them.

Posted on Jan 14, 2009

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Posted on Jan 02, 2017

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