Since there appears to be a difference of opinion between PepiMK (the expert in the field) and I concerning the effectiveness of adding "Secure Domains" immunization entries on systems other than Windows 2003 Servers, whether or not to add "Secure Domains" registry entries during immunization is an issue that you will have to determine for yourself using your best judgement.Is it necessary for a computer running 32bit XP not on a network?