From the Windows Defender Update Interface.Usually, there are three ways to update it: In some cases, however, you may come across issues such as this, when Windows Defender is not updating, or the update fails. In this case, the service should work well in the background notifying users of any detected malware or when something is wrong. This includes adware, viruses, worms, Trojans, Rootkit, Backdoor, ransomware, and spyware, among other emerging threats. Home › Fix › PC Software › Windows Defender won’t update
