I try to go to Google and get Error code: sec_error_unknown_issuer

Question

I try to bring up Google and get this message:
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.
What Should I Do?
If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue.
www.google.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. (Error code: sec_error_unknown_issuer)
I'm on a brand new computer. All I've loaded is Kaspersky Internet Security. This problem is *very* frustrating and annoying.
Yes, I tried deleting the cert8 file and restarting Firefox. Same problem.
Help!!!

Answer 1

And again, even when I exit the Kaspersky anti-virus software, I still get the error message. That does make it seem like the problem must be with the new release of Firefox (maybe in conjunction with Windows 8.1?), not with the anti-virus software.
Like Lydia, I really don't want to get into the business of just adding dozens of exceptions. That would seem to defeat the point of whatever security protection Firefox is trying to provide.