This is by far the most important question for you to answer before selecting guitar lesson software. Software that was designed by a reputable and experience guitar instructor is important.  Look on the website that is pitching the guitars software for a picture of the guitar instructor and a history of his or her qualifications.  Is there a sample video of the instructional methods being performed by the instructor that is pictured? There should be!  Look for recommendations about the software and reviews from other users before purchasing.