If the scan driver, CaptureOnTouch is not operating normally, follow the procedure below to uninstall them. Then, re-install the software from the Setup disc. (For more details, see 'Installing in Mac OS X".)
No uninstaller is provided for Mac OS X drivers. To uninstall, use Finder to delete the following files.
/Library/Image Capture/TWAIN Data Sources/P215.ds
/Applications/Canon P-215
Mac OS X 10.5 only:
/Library/Receipts/P-215 Driver.pkg
/Library/Receipts/P-215 CaptureOnTouch.pkg