Some other program is set to download and delete my messeges

I have a message on outlook telling me that some other program is set to download and delete my messages from outlook and that just encase this was an accident we've put them in a special POP folder, But if this was a accident I should change my settings ,But when I try to click on change settings it say's sorry cant asses this page, I did not authorise this so how can I find out what program is doing this and stop it ?