Security Alert- Internet Explorer 6.0

[yiannakop]

Hi everyone. I have a question for a problem I have with Internet Explorer. When I try to visit a webmail site, I see the message:

Security Alert:
Information you exchange with this site cannot be viewed or changed by others. However there is a problem with the site security certificate.
The security certificate was issued by a company you have not chosen to trust....

I have to press "YES" in "Do you want to proceed question.
I tried to do View Certificate-->Install Certificate. But the next time I visit the site I have to see that dialog box again.
How can I avoid this?
Thanx.

[PeejAvery]

1. Internet Options.
2. Click the Content tab.
3. Click the Certificates button.
4. Click the Untrusted Publishers tab.
5. Delete the certificate.