Content was blocked because it was not signed by a valid security certificate

IE10 win7.  We have one computer (doesn't matter who's logged in), where after logging into a certain site, they try to go to a page within that site, but it keeps giving "Content was blocked because it was not signed by a valid security certificate".  It looks like an embedded frame within the webpage.  When I click the I.E. lock, it says the certificate is ok.  If I click 'show content', it says 'access denied and shows an address ending in jsp.

When I log into it from firefox and go to that embedded page, it says "This connection is Untrusted".  w05.dealer.acme.com uses an invalid security certificate, but on the previous page, it showed that dealer.acme.com had a valid certificate.  Is this the issue somehow that it's adding the w05 before the address for this embedded page?  and below that is says "the certificate is only valid for www.optionsxpress.com.au  error code: ssl_error_bad_cert_domain.  I don't know what the optionsxpress.com.au site is, but shouldn't it say our company name there?

This site works on all our other computers with no special setup.  Can I remove\reset all the certificate stuff somehow on this one computer and let it start from scratch?