How do i delete my messenger archive ? i m trying to delete them but they always appear back...?

Apparently you think there is only one messenger service. Well there are hundreds. So how can anyone answer this without knowing what messenger you are using?

To view your messages, click Contacts on the Messenger Toolbar and scroll to Archive. Click there and look for your messages by person's name and date of message. Once you find the message you can open it by clicking on it. Once you get the Archive window open, look to the toolbar on the left-hand side, click edit, scroll to delete and click. You'll get another prompt saying this message will be permanently deleted, do you want to continue? Click Yes and that message will go away forever.