You will need a OCR programme if you wish to edit a scanned document. Some scanners will have a OCR facility.
I seached Google and found this method, but there was many links on the same subject.
Scan the document and save it as a jpeg. Then get FreeOCR which is an OCR program that will convert your scans to text.
Just run FreeOCR, open your scanned images, and press the OCR button and it will convert on -the-fly in seconds. You can then edir, remove or add words and resave the document. IT can even open the scans in Microsot Word as well.
Here is the link. The program is free and runs better than those you purchase.
16:04 Fri 13th Nov 2009