Step 1: Type ' command prompt' in Windows search box. This method will help you check whether the problem is caused by corrupt system files. Windows Defender Not Turning on in Windows 10/8/7 Fix 2. After that, run Windows Defender again to see whether the problem is solved.

Step 2: In the Services window, find Security Center service and right-click on it. Step 1: Press ' Windows + R' keys to call out the Run dialog box, then type ' services.msc' and click OK button to open Windows Services.

You can restart this service and see whether the problem is solved. You can check whether the problem is caused by closed Windows Security Center service. The Windows Security Center service monitors and reports security health settings on the system. Then, how to solve this problem? Please refer to the following methods. The Windows Defender just gives you a blank screen like the following picture. Sometimes, when you are going to do a full scan of your system, you may get Windows Defender blank screen issue. Is your Windows Defender showing blank screen? If you don't know how to deal with this problem, you can read this post, in which MiniTool offers 4 methods to repair empty Windows Defender problem.

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