Customers getting SSL warning message

Why is it that when I go to my site in internet explorer I get a dialog box saying:

"The security certificate was issued by a company you have not chosen to trust. View the certificate to determine whether you want to trust the certifying authority"?

It doesn't happen in Firefox.

I got my cert from instantssl.com. Would I have this problem with a verisign cert? I don't get this prompt if I go to amazon.com https.

Is there a list somewhere of which cert companies IE trusts by default?

 

 

 

 

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