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.
It is available for Windows XP as a separate download. Windows Defender does not scan for Viruses and the like as it lacks the antivirus definitions. It is designed to detect and stop spyware. Microsoft Security Essentials is for clients only. Forefront also includes modules to protect servers and even applications such as MS Exchange Email.