Shoutbox

They were possibly created by another user profile on the same computer.

A way to check is to run the cacls program on one of the logs.

You can do this by using the command prompt (start -> run -> "cmd" -> ok) and changing to the correct directory (type F: then cd "F:\Chat Logs\Novembre 2005" or wherever the logs are stored) then typing
cacls <old log name> (eg cacls andrewdodd13@hotmail.com)