I have been asking for a option in dxtroy to allow me to have it start with windows since windows 7 era.
Seeing as they still can not do this because the devs are lazy/inactive, never answered my forum posts or emails about it, I found a way to do it myself.
I made a video you can check out here on how to have dxtory auto start with windows:
https://www.youtube.com/watch?v=uVGVSEViOKQ
if it helps remember to subscribe and give me a thumbs up!
I answered your question btw.
http://forum.exkode.com/index.php?topic=1757.0