Click Check for updates and see if there are any updates available. Press the Windows key and type in Windows Update, then open the result. Solving this is very easy and requires no technical knowledge whatsoever, as long as you follow the steps below. One more possible cause for the problem is not having all the latest updates installed. If it isn’t, go to the last method and see if that helps. Once the command is 100% complete, your problem should be fixed. Type in the following command, and press Enter to execute it: sfc /scannow. Press the Windows key and type in Right-click the result and choose Run as administrator. If the root of your Windows Defender problem is a corrupt system file, this method will fix it. The System File Checker tool is a very powerful tool that comes with Windows, and is meant to scan, find and repair corrupt system files. Method 3: Run the System File Checker tool Restart your computer, and you should be able to run Windows Defender without any issues. Use the left side navigation pane to go to. 
In the Run window that opens, type in Regedit and press enter to open the Registry Editor.
Press the Windows and R keys simultaneously. Just follow the instructions in the steps below, carefully. 
The thing is that you should know which keys to edit, as messing up the wrong key can be fatal for your computer. The Registry Editor is a powerful tool, and it can often fix issues such as this one. If, however, it doesn’t move on to the next method. Windows Defender should be working just fine now. If you have another software, find the appropriate removal tool on the website. For example, McAfee’s removal tool can be downloaded here, and Norton’s removal tool here.
This should help you because oftentimes, when you uninstall the software, it leaves behind files and registry entries that might still mess things up.
Check the website of the manufacturer of your antivirus software. Follow the instructions until the software is removed. Click on it, and press Uninstall near the top of the window. From the list of software currently installed, find your third-party security software. Press the Windows key on your keyboard and type in Change or remove a program. It is well known that third-party software such as Norton or McAfee interferes with the built-in security features of Windows, so it is highly likely that this is the problem. The first, and obvious thing to do is to uninstall any third-party security software. Method 1: Uninstall any third-party security software There are a few things that you can do to solve your problem with Windows Defender, and by all means try all of them, because they tend to work in different situations, so one of them will definitely work for you.
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