How are you getting to Google? Try typing "http://www.google.com" in the address window of your browser. If you're still getting the same error, it could be due to malware that has altered your "hosts" file. Examine your "hosts" file with a text editor
such as Notepad. The hosts file is usually located at C:\Windows\System32\Drivers\etc\hosts.
A default hosts file will have only one line that does not begin with a "#" character and that should be the line:
If you have other lines in this file, you should clean out your hosts file.