If you scan something in on a scanner, what you save on your computer is an image. Kinda like a picture but not really. Just in 'computer language' anything from a scanner is an image.
A text program can't work with an image file. Image files can be changed with special programs - Optical Character Recognition, or OCR, programs can scan an image file and transcribe it into a text file.
There are several OCR programs out there, even some decent free ones. You may have an OCR program or option on your computer. I looked on my HP Pavilion and found HP Document Viewer with an OCR option. Some scanners have OCR programs. You have to open programs then check under listings, pull downs or icons to find options.
You also need an active Word program (MS Word). Several OCR programs will automatically want to put the OCR item into Word - some with NO options!
For example with my HP Document Viewer (HPDV): I can scan from there or pull from a scanned image already saved in my hard drive. HPDV has icons at the top, one is for an option to have the HPDV transfer the scanned item, worked thru the OCR option and opened into Word. POOF - there it is!
As said before, you do need to verify everything was transcribed correctly.
Note how it saves the completed file. You may need to do a 'Save As' to get it into a program you want. You may also be able to right click and choose the program to open your worked file(s).
Best of luck.