Norton not deleting Info.zip and photo.scr trojan/virus

Been fighting this for a while. I have a network drive/NAS that has hundreds of files and folders with photo.scr and info.zip on them. 

I delete them manually, but they always come back. I am pretty sure this is some kind of infection. 

Unsure why Norton isn't finding/cleaning it (because its on a network drive? It is mapped to drive L:) 

Any thoughts?