Win 10 WiFi Problem DELL 3521

Hello, everyone.
I had upgraded my Dell Inspiron 3521 from Win 8.1 to Win 10.
Wifi was working with not problems for a while but now its just stopped and I can't do nothing to fix it. 
I run command prompt as admin : reg delete HKCR\CLSID\{988248f3-a1ad-49bf-9170-676cbbc36ba3} /va /f 
system did not find it.
I did reinstall drivers from dell, also did not help.
I did : "Reset PC". It also did not help.
When I try to connect to my Wifi network it says "No internet. Secured"
It looks like it is connected but no internet access (yellow exclamation mark present).
As I understand I can't revert back to Win 8.1 because upgrade was done more then month ago.
It looks like I am stuck. I am struggling with this issue for two days. 
Please, help!

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