Internet Acting All Weird?

So over vacation my mom unplugged my computer. So today I try logging onto my computer and when I try to log onto a site it says "The certificate is not trusted because the issuer certificate has expired."
"This could be a problem with the server's configuration, or it could be someone trying to impersonate the server."

What does that mean? Why is it happening?

Also I cannot log onto my instant messenger. But everything else is working for me.

What the heck is going on!?
Its not even letting me into a local site.
>: /
 
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