If you've recently purchased a new computer and are having trouble printing documents to your Canon printer, or the printer simply is no longer recognized by your machine, then you are likely experiencing an out-of-date or corrupted Canon printer driver. Usually, a simple uninstall and reinstall of the software that came with your printer should rectify the problem. Sometimes, we misplace those discs after not needing them for years, or our new machine has technologically surpassed the printer and it simply needs to be refreshed via an updated driver.
http://fixmyprinter.org/canon-printer-support/