Here is the next thing that pops up after I reloaded windows 7

Every time I starts the Outlook I get the message that contains the following information. How can I stop it from coming up? If I say "yes" to the message the program will just go on. I have even followed the prompt after clicking the View Certificate..." button to install the certificate but it hasn't made any difference.

"The server you are connected to is using a security certificate that cannot be verified. The target principal name is incorrect. Do you want to continue using this server?"

I use my AOL email address. Never had a propblem before.

You folks are tops! Thank you in advance.

Thomas