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This is not question related to SharePoint, anyway you can take a look at below link for you solution
http://office.microsoft.com/en-in/word-help/scan-and-edit-a-document-HA010254879.aspx
http://www.computeroffice.law.cam.ac.uk/using_law_pwf/how_do_i_scan_to_editable_text_e.g._word.php