Try reinstalling an up to date driver - follow these steps from Canon http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=SupportDetailTabAct&fcategoryid=232&modelid=9388
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Try reinstalling an up to date driver - follow these steps from Canon
http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=SupportDetailTabAct&fcategoryid=232&modelid=9388