what happened to Google ?

When i try to access Gmail all web browsers say "This Connection is Untrusted "

www.google.com uses an invalid security certificate.

The certificate is not trusted because it is self-signed.
The certificate is only valid for 78-159-121-94.local

(Error code: sec_error_untrusted_issuer)

Click to expand...

Also i can't able access google.co.in When i search the address in google.com and click on it, it redirects to some other place says security threat analysis

Google search is not giving proper search results?

is google is hacked or my pc is hacked?

while Bing works fine. every other web site works fine.