Outlook Security Alert only on one Pc in the network

In a Windows 2008 domain with 25 pc's, we run Exchange 2007 std and Office 2007 on all Pc's except one HP Laptop running Office 2010.

In the Office 2010 laptop, when he opens email, he received a security warning. When we installed the server, we created a certificate and recreated it a few weeks ago. Now this one user receives the security every time he opens outlook. I'm wondering if I need to purchase a certificate from godaddy or other company to resolve this pervenantly.

Attached is a pdf showing the error.
SecurityError.jpg
LVL 25
Tony GiangrecoAsked:
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Andrea_Commented:
It looks like the certificate has not been imported on that computer.   You can click on View Certificate.  When the certificate properties window opens, click on Install Certificate.  Follow the installation wizard and place the certificate in the Trusted Root Certification Authorities store.  That should take care of the security warning.
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Tony GiangrecoAuthor Commented:
I'm checking to see if this fixed the issue.
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Windows Server 2008

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