Canon printer driver isn’t a virus. I downloaded canon printer driver from official ukrainian site: canon.ua. As I remember: i-SENSYS LBP2900. Avast think that it is a virus, but it isn’t a virus, it is just driver for printer. When I disabled avast, I can’t install driver, but when I disabled avast firewall from device manager, I installed him. Why it was so difficult to install canon printer driver? Is it a virus? 
what virus name does avast give the file?
have you uploaded and tested file at www.virustotal.com (if tested before, click new scan)
post link too scan result here