Local users group fileserver NTFS permissions

Hi,

We are setting up a redirected folders share on a FILESERVER  and would like to know if I could/should leave the FILESEVRER\Users in the ntfs permissions for the share folder. The reason I am asking is, because if I remove it, I then constantly get prompted "To continue you must be an administrative user...." , even though I am logged on with a domain admin account and UAC is disabled. Why does removing/adding a local users group has an effect on what I can do with my domain account?

Thanks!