Log on to the NAS server as the domain administrator.
Choose Start > Programs > Administrative Tools > Computer Management.
In the Computer Management window, expand System Tools > Local Users and Groups, then click Groups.
From the list of groups displayed in the right pane, double-click Administrators.
In the Administrator Properties window, click Add.
In the Select Users, Computers, or Groups window, type MPFServiceAcct in the Enter the object names to select text box, then click OK.
In the Multiple Names Found window, select MPFServiceAcct, then click OK.
In the Administrator Properties window, click OK, then close the Computer Management window.