Thanks for the advice. BTW, I too had a fling with Toolbox 5. This tip worked for me Win 7 and many thanks.. Then all was well! This article is fantastic – fixed it up: Re-installed Canon tool box 4. Man, you are a lifesaver.

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Greeting from Bangkok Thanks so much for taking the time to post this!

Next, there is a. Many thanks – brought my old scanner back from the dead: They sent me the installation cd’s but new install did not help. Heaven or Monaco, it’s your choice Posted on Nov 19, 7: Thank you so much ho this easy fix!

Unable to open Twain source – Microsoft Community

Thanks – I have spend many hours reloading programs looking for fixes. You are an absolute genius! Your instructions were clear and fixed the problem.

I opdn to press the arrow on my laptop and pressed wrong button grrrrrrrr, could canoscan failed to open a help plz thanks Hi CheekyKelz, Unfortunately the PATH variable is specific to your computer; as new applications are installed, new paths are added.


Unable to open Twain source

In the Variable value text box, scroll all the way to the right and then add in the path C: Left it at canoscan failed to open a for 32 bit and the scanner works. Your post helped me fixing this same issue with my Canon F on Windows 7. Thank you so so so very much!!!!! Mucho Gracias Senor Jeff! There is certainly a lot more files that are added compared to my F.

This works a treat! I’ve had this scanner for a couple of years – and encountered this problem for the first time today of course, when I needed it to work urgently. Thank you1 4 years since the post – canoscan failed to open a it still works! Don’t know if this has already been posted, but for Windows 7 bit users, CanoScan Toolbox 5.

Many thanks for the solution it is rare that such precise advise is found on the web Hello Jeff, thank you very much for posting this solution, it worked out fine for me.

On a hunch I uninstalled Photostudio and installed it on my laptop. Nov 24, 8: At this stage sit tight and I will download the driver and Toolbox today and see where it loads everything.


Canon Scanner – Unable to open TWAIN source

To start the conversation again, simply ask a new question. Thanks, this fixed my scanner problem too.

I could tell that both my drivers and the application to drive my older Canon f were installed and functional How satisfied are you with this reply? Camoscan I can use my scanner canoscan f.

Nov 20, 6: I just want to say thank you. Downloaded the driver and ran the installer. Saved me a lot of troubleshooting.

Solved my issue–thought I was going to have to finally upgrade scanners but now I can hold out longer. Canon D I am wondering if the store will take it back, because I am totally aggravated with it.