sorry

its a bug i tried to get rid of completely but couldnt quite, it has to do with .net being stupid on certain things.
have you tried ending the process in the task manager and starting it over again?
is there a eq2map_config.cfg in the updater folder (default is C:\Program Files\EQ2MAP Updater)?
if there is try opening it up and changing the part that has
Code:
<OptionName>AutoUpdate</OptionName>
<OptionValue>True</OptionValue>
to:
Code:
<OptionName>AutoUpdate</OptionName>
<OptionValue>False</OptionValue>