go to Start > Control Panel > Internet Options > Connections > LAN settings - make sure 'Use a proxy server' is not checked.

Start > Control Panel > System > Device Manager - are there any flags showing?

or maybe this? https://support.microsoft.com/en-us/kb/299357


>I go to the Device Manager and I see several Network Adapters. All seem to be functioning. Yet, I don't what to do next.
>
>When I run IPCONFIG I see message about all Adapters.. Media State - Disconnected. How to connect?
>
>
>>Hi,
>>
>>I unstalled Avast AV. But it took with the installation my internet connection. (I am typing this on another computer). How do I set up my Window 7 to be connected to my router again?
>>
>>TIA