Thank you so much. Finally solve my Connection Problem!! Explore your creativity with our Digital SLR range. You are an absolute genius! When it isn’t working using a USB2 port doesn’t help. My Canon f now is working properly Yeah This tip worked for me Win 7 and many thanks..

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It worked like a treat.

Jeff, Thanks a lot for your solution. Even that did not work.

See your browser’s documentation for specific instructions. Actual prices are determined by individual dealers and may vary. It really worked on my PC.

Canon Scanner – Unable to open TWAIN source

At last I am able to successfully scan my document. Rebooting, system restoring, reinstalling the app, reinstalling just the driver, running in compatibility mode, yada, yada. I added the environment variable and it fixed it.

Thanks for the advice. In the event service is required for the Product during the limited warranty period, Canon USA offers two hardware support options: Canon emphatically claims that there canosccan no driver available for Windows Searching the Internet for this problem turned up several canoscan 4400f twain having the same canoscan 4400f twain and several solutions which looked like they may or may not work. Can Cannon be any more bad at support? Information Management Information Management.


I was about to do some canoscan 4400f twain and was saved by this post! I updated the drivers from the Canon site but that did not help.

New windows 10 driver for Canoscan F – Microsoft Community

Stylish and practical hand held, desktop, scientific and printing ranges. Last edited by grisu70; 28 Aug at Thanks for posting this!

Thanks for sharing this!

Why cant Canon have this on their knowledge canoscan 4400f twain. It is disappointing that the troubleshooter should have missed something so basic – yet so obscure for people not familiar with DOS. Just want to say thanks a lot for this! When I try to use it again a couple of hours laterit keeps canoscan 4400f twain the server is busy and to switch applications, when I do that it still says that the scanner is busy.

It’s people like you that actually help the world go round. Glad that I can still use this old scanner which was a really good model.


You will be asked for the Product serial number and other information pertaining to your Product and for a ship-to location for the replacement Product must include street address. You would think that Canon’s Drive installation program would just add the correct Environment Path as part of the install process. Find the perfect lens Find the perfect lens. My scanner now works: So I can confirm, Canoscan 4400f twain 7 x 64, this advice works!

Lo and behlold, I added the C: It would just give me a “Scan failed” every time. I checked scanner operation each day since the previous “fix” and it worked canoscan 4400f twain for 3 days, now it doesn’t. Thank you very much for solving this annoying thing!