Error 404
Error problem

When i start mozilla error page came showing that (This Connection is Untrusted)

You have asked Firefox to connect

securely to www.google.com, but we can't confirm that your connection is secure.

Normally, when you try to connect securely,

sites will present trusted identification to prove that you are

going to the right place. However, this site's identity can't be verified

PLS HELP ME

WT SHOULD I DO NOW :-(