I have two user accounts on my everyday PC.
One admin account and on standard user(not admin) and I always run everything as the standard user for an extra layer of safety.
When I ran the NIStune and ROM installation on this PC I pushed "next, next, next" as always

Also a bonus bug that I noticed.
When I push the lower "Comp" X button to remove an image from the list the image name stays in the list until I select it in the first list but I can see that Nistune actually drops the image in the background if I have compare enabled. And I am using V1.2.84