Try flushing you dns cache
Open a Command prompt
Type ipconfig /flushdns
If that doesn't work check your HOST file...
Navigate to C:\WINDOWS\system32\drivers\etc.
Open host file with notepad.exe (you may have to run as Administrator to change contents)
If you find an entry for Google,delete it. Google's IP address changes from time to time, so an outdated IP address cached on your computer can create problems when you try to access Google.
If that doesn't work running ping and/or tracert to
www.google.com in command prompt and post results.
ping www.google.com
tracrt www.google.com
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