What's the definition of one's soul? Energy within the body that depletes after the human form is dead. so why would not your soul stick around if your body and mind and sight is still active perse as the living dead. or would you just be a shell for a spirit. which in many forms would be a soul.
So yes, all things living have a soul and Hollywood's adaption of the undead would still have a soul in my way of thinking, if they still remember their years of life and still have the same soul as when they were alive and feelings and sight as we are today. energy would still be in the body in some form.
I think what made them human left, hence theyre vampires now. So by that logic theyre soulless. Considering theyre often shown needing living blood for their own strength, depending on humans with souls to keep them going it just further indiciates that they lack something (and i wouldnt say they just lack blood but more specifically the essence inside it). Id say this all mainly depends on what youd consider makes someone human and what is essential for humanity. In many adaption the vampire once it dies has no afterlife or anywhere to go, which also supports them not having a soul that can go anywhere / go to "heaven"
Altered soul but still have a soul. For if not it would be like zombies (From movies) the only thing they know is to feed. Walking around aimless and without care no thoughts, no feelings, no hunting. Just want to feed so is vampire like that, no reference of the past, no hurting, no compassion, walking around aimless.
I still believe there is a soul within it all.
Could be! But it's most definitely changed. Vampire Bill is a good example from True Blood, and so are Lestat and Louis. BUT, it could also be said that perhaps their infinite time on earth, and witnessing everything they love break, and everyone they love die has made them colder.