Hello.
The issue that you are experiencing could be caused by other TWAIN devices that have been installed previously on the computer. Removing these devices from the Windows Twain32 folder may resolve this. To do this, please follow these steps:
1. Click on Start.
2. Type TWAIN_32 and press the ENTER key on the keyboard.
3. When the TWAIN_32 folder appears, take note of what is in the folder. We are going to move anything that is not needed for the Canon unit to operate. Files that are going to stay are wiatwain.ds and any Canon-related folders. Canon folders could be named MPxxx or CNQxxx. Leave those files/folders in this window. If there are any others, right click them and left click on CUT.
4. Close the window. On the Desktop, right click and left click on PASTE. The folder should now be on the Desktop.
5. Click Start and then search for TWAIN_32 again. Click on the folder that appears in the results above.
6. In the TWAIN_32 window, repeat the above process until all that is left in the TWAIN_32 folder is wiatwain.ds and the Canon folder, for example MPxxx.
Once that is complete, restart the computer.
When the computer restarts, attempt to scan again.
If these troubleshooting steps do not work, feel free to call us at 1-800-OKCANON.
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