Thanks a million to all of you. HAL your link looked like rocket science to me. ROTFLOL
To put it simply, try to scan your document with enough resolution to distinctly separate each letter on the page. Look at the scanned image and make sure a visible gap exists between each letter - except for letters printed with a ligature, i.e., without a gap, which typically occur in combinations like "rt". About 200-to-300 dots per inch (DPI) of resolution is usually sufficient to get accurate OCR output for most documents.