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Do so only if you trust the source and know that it contains no harmful scripts. One way to solve this issue is to whitelist the app or site in question. Sometimes, a website or an app may not play well with Defender causing unnecessary conflicts and crashes. How to Add Exceptions/Exclusions or Whitelist in Microsoft Defender

You will enable Real-time protection, Cloud-delivered protection, Automatic sample submission, and Tamper Protection.

Open Windows Security and click on Virus & threat protection. We will go through each to make sure you enable all possible forms of protection available to you. Windows Security comes with four options. Enterprise users should check the official guide. Note that uninstalling any third-party antivirus app should automatically turn on Microsoft Defender. It is not advisable to run two antivirus apps on the same machine at the same time. More often than not, the installed antivirus app will turn off Microsoft Defender and that’s how it should be. In that case, the rules will be governed by the installed app.

Microsoft Defender should be turned on by default unless you are using a third-party antivirus app. I have already covered how to turn off Windows Defender (linked again for those who skipped the intro) but still don’t recommend it unless you are using a reliable alternative. Another can be troubleshooting, something that I do on a routine basis. There are a few reasons why you should know how to do it. Note: We estimate that Windows Defender will appear as Microsoft Defender on Windows after one of the Windows 10 updates due in the coming months.