Everytime I try to use the scanner it says an error shows that says cannot open twain source?

This is an issue with the Driver Installation, Get the drivers Uninstall and reinstalled from the CD.

Hello.

Give this a try (found online):

Download Irfanview:

http://download.cnet.com/IrfanView/3000-2192_4-10021962.html

Open the main app "i_view32.exe"

With the scanner hooked up, click onto the "file" (tab)

Click "Select TWAIN Source .." and select your scanner in the source box (if it is listed, the driver is functioning)

Click file (tab) then "Acquire"


Hope this helps.

I a have many years reparing canon scanners so here is my suggestion for you.

You didnt specify what scanner you have but your problem is a common one. I would go to the website of the manufactuer of your scanner and download the latest drivers (try googling the make and model of your scanner and adding drivers on the end of it), which will include the twain drivers you need then I would try the scanner again. I think this will correct your problem.

I hope this helps you out.

Driver mismatch - the driver of the scanner has forgotten the location of the TWAIN driver because another software has been using it lately. Follow this
http://weblogs.asp.net/jeffwids/archive/2009/11/02/canon-scanner-unable-to-open-twain-source.aspx

It your using a newer windows you probably need new software. Try Vue Scan it worked for me on Windows 7 64bit and I have the same scanner. With out dated software it wont recognize the scanner. Hope it helps

Have you tried deleting the scanner from add/remove hardware under control panel? If not, try disconnecting it from the computer, then try deleting it, then retry the install one more time.

Your Train source may be your scanner Twain driver. Reinstall the driver. 
http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=SupportDetailTabAct&fcategoryid=235&modelid=11463#DownloadDetailAct

already install the scanner driver but still can't working properly.

tried uninstallin and installin canon scanner drivers..nothing works..still seeing unable to select twian source..

so i tried an alternative..here we go..
on vista 64 os/vista any version..click Start>All programs>Windows fax and scan

next click new scan on top and that got me going.

some say there are issues with the way usb talks to old scanners with new operating systems like mine (vista 64). hope it helps until you find the actual cure.

check the lenght of the cable