Security Certificat​e Error

Hi. I have a Toshiba Notebook. For the last 6 months i have been getting this message on a few safe websites that i normally visit :-
"There is a problem with this website's security certificate"
The security certificate presented by this website was not issued by a trusted certificate authority.
 Security certificate problems may indicate an attempt to fool you or intercept any data you send to the server"
 My Date & time are correct.
Anybody know why this is happening? It is quite frustrating.

See this Microsoft article.
   "There is a problem with this website's security certificate" when you try to visit a secured websit...
If you need to contact us further, tell us which computer you have. There is a label on the bottom.
-Jerry

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