OK great but just a suggestion xp sp2 has DEP enabled
[Data Execution Prevention]
this actually confirms whether the user wishes to run the program first however mirc.exec does not use this
Publisher unknown shows up because the exec doesn't have a valid digital signature that verifies its publisher
this problem would of been spared to us if that process would of been used to spread the program
However Fortunately problems like this never effect me (much lol) because I have a habit of always running task manager at first boot up and use startup control panel by Mike Lin to check whats going to start up next boot up
BTW you can get that program
Here also from him to alert you when something is set to run at
Startup 
