This seems to be known issue with Windows 7. This happens if Apple Bonjour service & Adobe CS3 products running on the system.

Please go through below articles for the same.

Apple Bonjour service

http://support.microsoft.com/kb/970313

http://msmvps.com/blogs/richardwu/archive/2009/12/18/windows-7-use-0-0-0-0-as-the-default-gateway-problem.aspx

Adobe – CS3

http://social.technet.microsoft.com/Forums/en-US/w7itpronetworking/thread/765aa1c6-dd9a-4447-9de0-aecc41498b04/

http://forums.adobe.com/message/1634806#1634806

• Disable & Stop C:\Program Files\Bonjour\mdnsresponder.exe

Or

• Run the following command
•  “C:\Program Files\Bonjour\mDNSResponder.exe” -remove

This removes the service and restarted the computer to solve the issue.

Happy Learning!!!