"once a doc has bee scanned, when I double click on it opens windows picture and viewer"
That's because scanners only generate pictures of things.
If you want to turn it into text, like a Word document, you need to get it OCR'd. Some scanner software will do that all in one operation, if you tell it to. Others you may have to do two passes - first scan - then OCR.
How you do it depends on the software that came with your AIO. Look in the help file for "scan to text" or something similar.