Canon PIXMA MX320 Manual page 798

Uninstalling the MP Drivers
Select Remove driver and driver package, and then click OK.
In the confirmation dialog box, click Yes.
When data collection is completed in the Remove Driver Package dialog box, click Delete.
5.
Click OK.
The deletion of the printer driver is complete.
Important
You may not be able to delete the printer driver properly from the Installed printer drivers list.
If this happens, restart your computer, and try again.
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