when i am going to on the defender (error code 0x80070424) appear what can i do?

Hi, The issue can be caused the following factors: 1. Windows Defender service has been stopped or is missing from the Services list 2. The following registry key or its sub key is missing or corrupt. Please check Windows Defender service first. a. Click Start -> type services in the search box -> Press Enter. b. In the list, double click Windows Defender, then start the service. If the service cannot be started, please download the import the related registries. https://skydrive.live.com/#cid=1F53C9234D966154&id=1F53C9234D966154%21190 Niki Han TechNet Community Support