Network icon not appearing in taskbar but shows as working in Network Connections. Just doesn’t appear to be getting an IP.

This worked

http://answers.microsoft.com/en-us/windows/forum/windows_7-networking/windows-7-diagnostics-policy-service-not-running/a73dbb62-86f8-4f3e-98aa-8e71c126ecd3?auth=1

go to start ,search and type:- cmd, right click on returned cmd.exe and select “run as administrator” at the prompt type:-

net localgroup Administrators /add networkservice
press enter then type:
net localgroup Administrators /add localservice
press enter then type:
exit
press enter and restart your computer

Open services and make sure the service is started.