Go to Windows Update and download the fix entitled "Update Root 
Certificates," and that should fix your problem. Having an out of date 
root certificate may cause the site certificate checked against it to 
not be trusted, and that may be what is causing your issue.

Greg Moyer wrote:
> Hello:
>
> I am getting a certificate error for every web site i visit.
>
> The message is the certificate for this web site is expired or nolonger valid.
>
> I get this message on all web sites. i have gone under tools, advanced and security and unchecked everything, and have even reinstalled the certificate.
>
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>   

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