Canon S400 User Manual page 346

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You may not be able to print correctly if a WPS (Windows Printing System)
driver is installed on your computer.
Click Start, point to Settings, and click Printers.
1
If a WPS driver is installed, right-click the icon and then select Properties
2
from the pop-up menu.
Click the Details tab and check the "Print to the following port" setting.
3
If the selected port is the port also used by the S400, change the WPS
driver port setting to FILE or delete the WPS driver.
WPS
DRIVER INSTALLED
?
An Error Message Appears
Troubleshooting 346