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Have you tried installing a downloaded scanner driver appropriate for both your printer and for your Windows 7 ?
If you have done that and it failed, with what error message does it fail?
Also... Canon printers usually scan most readily using MP Explorer EX (a program distributed for free with Canon printers) or Canon Scan (another program offered free with Canon printers.) Have you tried either of those two? some programs, such as One Note, cannot work with Canon scanners... which are still perfectly workable with Canon's own scanner programs.