Question about Canon CanoScan 8600F Flatbed Scanner

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I downloaded a net program, and it screwed up my visual programs (ACDSee, Photoshop). I deleted the old programs and downloaded new versions so they now work). But now my scanner will not scan but says "unable to slect Twain Source" when I try. How can I fix this problem? I have a Canon 8600F scanner.

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If you're running XP or higher, and not too much time has expired since you installed the net program, your easiest bet is to restore your computer to a date earlier than the installation. Restoring doesn't lose any of your files, but it restores your registry and it's settings to the previous states, and that may restore your scanner.
The Twain settings plug-in allows preset scanner profiles to be sent to your scanner. This removes the need for the operator to use the twain user interface. Refer to this web blog for more information:

I've seen it as an option in software, but you may have to reinstall your driver for the scanner in the control panel options.
This can be tricky stuff- a very competent friend of mine spent 12 hours before he got it working, but that was a few years ago, and it's supposed to be more automatic and easier now, and it is, until a problem like this crops up.
Good luck, hope this helps, and thanks for using FixYa.

Posted on Sep 07, 2010


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I downloaded a net program that screwed up all my visual programs (photoshop, ACDSee). I removed the old programs and downloaded replacements. But when I tried to use the scanner it said, "Unable to select...

Most likely you removed the driver or it was corrupted when you had the other problems. TWAIN is the standard for the driver that lets the hardware talk to software for this scanner. (Some newer scanners use WIA which is a Windows (Microsoft) protocol.)

To get the scanner to work, uninstall the current driver and unplug the scanner's data cable. Go to the Canon support page and download the driver and software (Toolbox if you want it) for your OS: . Then plug in the scanner.

I hope this helps.

Cindy Wells

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Windows 7 and Vista generally have the framework pre-installed.
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