I bought the Lide last year, plugged it in and Windows 10 just installed it for me. I have a F and if you follow his instructions, it should work! This time for CanonScan Lide 25 I’ve had to downgrade due to power supply failing on my F and haven’t worked out what the problem is yet. Help, I think I messed up the entire path line accidentally. Still a mystery why the path did not get added automatically though. No luck for me, but awesome this has worked for so many people. Thank you for helping Franco.

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Your post helped me fixing this same issue with my Canon F on Windows 7. Fantastic straight forward information!

Quick, easy, simple acnon makes my scanner work again! Does anyone know why this happens. Thanks so much for making my day easier.

Left it at 32 for 32 bit and the scanner works. Sunday, May 04, 2: Such a simple fix, but so deep in the details. Thanks for sharing this! This will bring up the System Properties dialog canon canoscan twain should already be canon canoscan twain the Advanced tab. Thanks for your time and being such a great help A very big thank you goes out to you from Sweden!


Hi Jeff, Thank you very much for the clear and concise instructions, it helped to fix the error quickly.

Reinstalling drivers did not work. Click the link, select [ Save ], specify “Save As”, then click [ Save ] to download the file.

CanoScan N1240U

Lo and behlold, I added the C: Awesome – Worked Perfect. You’ve saved me from getting insane! Thanks, Tibor I was unlucky canon canoscan twain didn’t work – still: Why couldn’t Canon twaih that right? Research and Development Home Canon U. This was very helpful. Works for canon lide25 Thanks Canon canoscan twain much.

I had been trying various solution found on the internet: Thanks a lot for the trick.

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Toggle navigation Jeff Widmer’s Blog. Tuesday, October 20, 4: Your path fix worked perfectly. But we just moved canon canoscan twain scanner to a new computer, installed the software and then started getting the “Unable to Open Twain Source” error message. Canon wasn’t even able to fix this for me.

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I managed to get it working. In the Canoxcan value text box, scroll all the way to the right and then add in the path C: After umpteen uninstalls, reinstalls, reboots etc etc I found canon canoscan twain post and hey presto all working ok.

I still don’t know how my path variable got erased, but who cares, it’s fixed now. How can I fix it? Modify your canon canoscan twain settings to allow Javascript to execute.

Jeff, Thanks a lot for your solution.