If you are experiencing certificate errors when browsing the web,
such as the one below
www.xoxoxo.com uses an invalid security certificate.
The certificate is not trusted because the issuer certificate has expired.
The certificate will not be valid until 3/27/2011 2:21 PM.
(Error code: sec_error_expired_issuer_certificate)
And no matter which browser you are using, (IE,CHROME,SAFARI,FIREFOX), the same error occurs.
There is a simple fix.
Just set the correct date and time on your system clock and all will be ok again.
See here for an example listed