Pop up saying to enter username and password every second

i reenter and it still pops up.  i tried going under advanced settings appearance and uncheck email  but it still pops up and i can't send email

Hello Tara,

I apologize for the inconvenience caused to you. Could you please be more specific about the pop ups that you are receiving or please contact AVG technical support by clicking the below link :  http://avgread.me/1JTENkp to acquire further assistance .
Thank you.