Stuttering ruining immersion

[PACMAN79]

Ok did that, the size of the files and folders it downloaded were exactly the same. I renamed my old Amnesia folder and it recreated settings and a profile. This time I even put up the SSAO to x16. As always, smooth as silk, I played up until the entrance hall, saved and exited. I then start up the game again and it exhibits the stuttering before any ghostly sounds/speech and sometimes when I'm running.
What now? From what I can see the game is being downloaded in its entirety everytime and it is not a steam issue.
Open AL issue? Or perhaps an Nvidia driver issue maybe?