Internet Connection issues

[Chris650711]

Have tried all suggested checks and tests and the Windows Network Diagnostics test on PC has returned the message 'Wi-Fi doesn't have a valid IP configuration'  (Not Fixed) 

The reset of the wireless adapter was completed but the investigation into the router / modem issues failed. 

I don't know and I can't see any obvious next steps to take in this to try and get the issue resolved. Can anyone help? 

[TimmyBGood]

@Chris650711 

Completely shut down the PC, then unplug the router from its mains connection.  Plug the router back in, give it a couple of minutes and then boot up the PC.