you need OCR software.. SimpleOCR is a popular OCR software that can be used scanned documents to text file or word documents. It is a great software for those who wish to recognize there text from scanned documents. It is also a royalty free OCR SDK which developers can use in there applications.
To use it simply insert the printed document into the scanner, SimpleOCR will then scan and analyze the text and will present it with an spell checker view so that we can correct any mistakes that it could have made. After that you can save the result to a text or word file.
check out the following link you will get free version of SimpleOCR ..
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