1) For best results set your scanner to 300 DPI , 200 DPI is the minimum setting to achieve acceptable results.
2) Use the rotate buttons (to the left of the image) if your image is upside down or rotated
3) If your document has columns or pictures then just select the text area by drawing a box on the image with the left mouse button
4) After OCR you can use the export button to Word or copy/paste the text into any Windows application