Run SFC ScanĪn easy way to resolve the Windows Defender not starting issue is to run an SFC scan.
In most cases, the fix should solve your problem, if it doesn’t move on to the next steps. Now check, if the Windows Defender Service is working or not.
In the Services window, locate Security Center.Type msc in the dialog box and press Enter.Press Windows + R to open the Run dialog box.
So, here are the steps to enable the Security Center Service or at least check, if it’s running aptly – One of the probable reasons why the Windows Defender service is not working could be because the Security Center Services are not running properly. Here’s an in-depth review of Systweak Antivirus