Hi Mayfly,
If you have any antivirus, firewall or anti-spyware programs installed on your computer, please temporarily disable them and then attempt to reinstall the printer, as these programs can sometimes block the detection and successful installation of the printer. Once the printer is reinstalled successfully, you can re-enable the protection software.
Should you still experience difficulty with the printer being recognized, we ask that you please contact a Canon technical support representative here for further assistance. A representative will be happy to assist you free of charge.
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