Security Certifcate error in IE & Firefox

XP Home SP3 - IE8 (and FF 3.5) I have client here and he regularly uses sites from First American Services. Their main page at http://www.firstam.com/ is OK and presents no issues. However, the sites my client needs to access puke up a Security Cetificate Error on any PC using any browser (screen shot from IE attached). If I click on the "go to this lage anyway (not recommended)" the page opens and works OK, but as soon as we try top navigate to a different part of that site, we get slapped with the same error, and it's a bit time PITA having to click "go anyway" every time. I have added 'unrecognized' certificates in the past in Vista (I don't remember how I did it :-o ), but I need to get these pages to open OK in XP. One of the sites is https://vendor.fafs.com/Pages/login.aspx and another one is https://pc.fafs.com/ . . . Yeah- I realize they are both httpS sites . . . any suggestions will be appreciated!!!!