The Home Depot Inc. now estimates that its Sept. 2 data breach put the some 56 million payment cards at risk. The Atlanta-based home improvement retailer (NYSE: HD) on Thursday confirmed the malware used in its recent breach has been eliminated from its U.S. and Canadian networks. “We apologize to our customers for the inconvenience and anxiety this has caused, and want to reassure them that they will not be liable for fraudulent charges,” said Frank Blake, chairman and CEO. > Click here for…