Recent versions of Norton Antivirus added a new "instant messaging scanning" feature, which
can conflict with Messenger and cause this type of behavior. To stop it, open Norton
Antivirus (Right-click on the Norton Antivirus icon in the System Tray/Notification Area (by
the clock), choose 'Open Norton Antivirus'), click Options, then Instant Messenger then
uncheck MSN Instant Messenger and click OK.
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Jonathan Kay
Microsoft MVP - Windows Messenger/MSN Messenger
Associate Expert http://www.microsoft.com/windowsxp/expertzone/
Messenger Resources - http://messenger.jonathankay.com