Windows NT
Go to Administrative Tools > User Manager in your Windows NT operating system.
From the menu bar, select Policies > User Rights. The User Rights Policy dialog will appear.
Select the Show Advanced User Rights check box at the bottom of the dialog.
Click Add. The Add Users and Groups dialog will appear.
Make sure that the drop-down list at the top of this dialog has your own computer selected. Click Show Users and select FTPServer from the list
Click Add.
Click OK in both dialogs.
Go to Start Menu > Settings > Control Panel> Local Security Settings
Navigate to Security settings > Local Policies > User Rights Assignment
Double-click on "logon as a service" under the policy column on the right side of the window
Click Add... and then select the new user you just added (FTPServer) and click OK twice.