Hilton Hotels & Resorts (formerly known as Hilton Hotels) is an international chain of full service hotels and resorts and the flagship brand of Hilton Worldwide. The original company was founded by Conrad Hilton. As of 2010, there were over 530 Hilton branded hotels across the world in 78 countries across six continents. Hilton hotels are either owned by, managed by, or franchised to independent operators by Hilton Worldwide.
3. Scan for Malware. Another significant source behind not working of Windows Defender is the presence of any malware on your computer. A proper and thorough scan are required to find out them. The most used tools are the MalwareBytes Anti-Malware and Microsoft Safety Scanner.
I also like Bitdefender Free, and it is light on almost all systems, and it has a detection ratio high, very high. But I think Avast is more customizable and stable. Windows Defender (on Windows 10) can be a mediocre protection solution, it is more easy to configure and use. But it depends on what you do, for example if you navigate a lot I would suggest Avast, of course.