I do not have USB2 on the laptop, but easily disproved that theory by using the scanner on a desktop running the same operating system, with no difficulty under both USB2 and USB3. How satisfied are you with this response? Posted 20 January – Home About Download link sent Publications. My Computer You need to have JavaScript enabled so that you can use this

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My Computer Computer Type: I have yet to find any difference from one win7 machine to the one that does not work except the path variable difference that had been added in the PC that does not work.

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Thanks for marking this as the answer. This had been driving me nuts. It won’t work on a 64 bit version of W10 though – I’m pretty sure of that.

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Technically, I am hopeless, but this really helped a lot! Please re-enable javascript to access full functionality.

Canon scanner “Unable to open TWAIN source” error.

New 08 Apr 5. I hope this is enough information to give someone a start as to what is happening here. Did this solve your problem? November 25th, at Sorry this didn’t help.

August 14th, at It has puzzled Canon, nothing toolboox the forum so far has a solution and I am puzzled as I have spnet many hours on this. I looked at the links. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in.

Re-boot the computer no help.

One can detect and run Canon Toolbox for scanning, the other does not. New 07 Apr 3.

Unable to open Twain source

Then type ; and then paste the canon path. Posted 23 March – August 12th, tpolbox Hi, Its a brand new computer running bit windows.

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The older computer is also running bit Canozcan 10 upgraded from Windows 7. Firstly, thanks in advance for any help received. October 1st, at Thank you in anticipation! I have read forums that recommend adding a system variable to the path.

Unable to open Twain source – Microsoft Community

I also have Arc Soft Photostudio and it cannot find it either twain error. Sign in anonymously Don’t add me to the active users list. The scanner works fine on my 4-year old Dell XPS running Ho 10 and the exact level of update.

Thank you for this. Hope this information is helpful.

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