Delete this folder also. I have confirmed the scanner is a Mac supported model, and I’d rather not return it! Like with many others, this problem just happened recently with the CanoScan working great before. Hi Rick, Try downloading the latest version of the Windows 7 bit Canon software from Canon’s website: I knew this was a tricky one and so far no one has figured it out.

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canoscan failed to open a The other machine did not need the path variable and it works opej fine. Thanks, this fixed the problem. A good tool for testing and troubleshooting is to download Irfanview, which has Twain ti scanning tools under the File menu. Anyone knows something about this problem, or preferably, to fix it? Nov 24, 5: It definitely wasn’t working with 5. Seems canoscan failed to open a I have a problem with every scanner I connect and I luckily keep finding this solution to my problem.

Once again, Thanks a million! Running Toolbox as Administrator helped me.


brand new Canon 5DS R; Focus says it can’t open my .CR2 file – Helicon Soft Forum

I previously had an HP multi-function installed, but have searched and removed these files canosdan drivers. Opened PSP 7 and entered scanner heaven. If it doesn’t, then we need to look for the presence of some files. This was a caoscan help. Then run canoscan failed to open a CanoScan canoscan failed to open a again and set the scanner and application.

Tell us about your experience with our site. Thanx for the tip! I’ve been rescued by this fabulous advice again. I am fairly knowledgable with PC’s but this one stumps me. Because, obviously this trivial problem is causing trouble and time loss to thousands of users.

Canon Scanner – Unable to open TWAIN source

This site in other languages x. Thought I’d have to buy a new scanner. Your very clear steps fixed it 1st time.

Thanks so failef – this solved the problem which I have had for almost a year, since I went over to Windows 7 64bit!!!! But I suspect it is related to a recent system ‘cleanup’ that I did Thanks heaps!


It was not necessary to remove or replace the version in this location. The scanner had been working propoerly for two years, then suddenly quit The exact download link is: I tried this and it did not work.

I did not understand what i was doing, but i followed your instructions and it is working now!!! You, sir, are amazing. Once everything is done you will need to reboot before everything will work. Better than some of the other solutions that are out there. I use the Canon software CanoScan Toolbox to operate the scanner and when trying to scan I was getting the following error message: Works canoscan failed to open a a charm!

This fixed worked when reinstalling the drivers and CanoScan did not.