Hi,
your Virusscan is the problem
http://support.microsoft.com/?kbid=271951

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Ich habe nichts gemacht, gestern gings noch
> Using Outlook 2003 on Windows XP Home Edition, the setting for Incoming Mail
> Server' for a POP3 server keeps reverting to 'localhost' whenever I logoff
> and log back on. How can I get the value to stick? What on my system would be
> interfering with this? I am running from a limited (rather than
> administrator) account. Could that be part of the problem?