system
7
This problem happens to Me also ,but I was using the free version of avast “anti virus” ,when I want to renew my avast anti virus, avast take me a 30-day of avast internet security ,I upgraded to internet security and same of your problem happens to me ,I fixed this by restart my PC and logging to windows in “safe mode” ,in safe mode everything was good and internet was working ,then I restart PC and logging normally to windows and internet became working 
sorry I’m not good in English
,I hope you understand what I say.