Printer Repair Questions? Ask IT Technicians for Answers ASAP
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I think the disc won't suffice.
You probably need to download the proper driver from Canon's website, from the page for your printer there, and the correct driver for your operating system version on your computer.
But what is the OS on your computer? Windows, or MAC OS X ?
And what version of either one is it, please?
The website for Canon's MG6865 is here, approximately:
Let me know whether your computer has Windows on it, or is an Apple, and I will continue to advise you.