Something redirecting your internet sounds like a virus or malware. Are you typing in www.google.com in your browsers address bar or clicking on a link? I would make sure and do a thorough virus scan and malware scan.
It happened to me too when I installed waterfox by importing settings from chrome. All I needed to fix the problem was to delete cookies (I deleted all cookies because I'm lazy, but I assume you can pick all the google or gmail related domain and delete them).