1. To disable windows defender system in Windows 10, click the Windows logo on your screen.
2. The main reason you are taking this route is so that you can easily locate the settings. Click the gear-shaped icon at this section to open the Windows settings.
3. Once you are able to open the settings, locate Update & Security, then click on it to open it.
4. By the left side of the panel, you will see a list of options under "Update & Security," but click on Windows security.
5. Just directly at the right side of the panel, a list of options will be displayed for Windows security, then click Virus & Threat Protection. Doing this will cause viruses & threat protection to be opened, then you can click on Manage Settings.
6. At this point, you should see something like "Real-time protection", then click this option to activate it.