The DNS isn't on your PC, but somewhere on the Internet and accessed by the mail server of your ISP. And the only one who can possibly solve the problem is the mail server manager at your ISP's. So all you can do is contact the help desk and complain.
Hope this helps.
I am running a P-IV-1.6, 93GHD's, 512 Ram, Win XP Pro, high speed cable connection. Just recently,(within the last week, week and a half) I get a lot of my emails bounced back by my mail server with the message that these messages were not delivered due to mis configured DNS. I am using OE 6.0. This will happen for a day or two, then I will have no problems for a few days and then one day I may have all emails bounced back. I do routine maintenance every week, also use AVG, (free version), Zone alarm,(free version). If any one has any input, it would sure be appreciated. Thanks, Bill