NAV Can't seem to remove Trojan.Metajuan

Each time the system boots up, Norton (Corporate ed 10.1) finds Trojan.Metajuan in file uacgfppedoc.dll in location globalroot\systemroot\system32. Tells me to reboot and after coming back up, it’s back again. There’s three user accounts and it finds it in all three, including the admin account. What’s creating this file and when? Ron