Good time of the day

I am facing problem with using windows 10 features like start, wifi, cortana, mail and others. These features are not working, when I press to the features, nothing is shown. 2 days ago I have installed antivirus Kaspersky after which these features not working. I have tried many methods to solve this problem but no result. I have uninstalled antivirus as well, not helped. Please help me to solve this problem.

Some info about laptop: Dell inspiron, Windows 10, 64 bits

Best regards 

Akhrorjon