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Getting started with anti-malware in Microsoft Defender
Microsoft Defender can help protect your entire family's Windows, Android, and Mac devices from malicious apps and other malware.

Label and protect files in File Explorer in Windows
Label and protect files in File Explorer in Windows by using the Classify and Protect tool.

Password protect your XBOX profile
Learn how to password protect your XBOX profile, get your XBOX console to remember your password, and change the password protection on your profile.

Secure your account if you think you’ve been hacked
Enabling these in your web browser helps detect phishing websites, helps protect you from downloading or installing malicious software, and alerts you about any potential scamming websites.

Protection History in the Windows Security App | Microsoft Support
If you want to confirm that PUA blocking is turned on for your device see Protect your PC from potentially unwanted applications. This app has been blocked Microsoft Defender SmartScreen has the ability to block potentially unwanted apps before they're installed and if that happens you'll see a blocked event in the Protection History.

Protect your PC from potentially unwanted applications
Windows Security has reputation-based protection that can help protect your PC from potentially unwanted applications. Potentially unwanted app blocking is turned off by default for enterprise and consumer customers.

How to start a scan for viruses or malware in Microsoft Defender
Select Device details Select Manage in Windows Security Select Quick scan Tip If you want a deeper scan, instead of selecting Quick scan in step 3, select Scan options and choose the type of scan you want. For the most complete scan, run Microsoft Defender Offline. For more about that see Help protect my PC with Microsoft Defender Offline.

Virus and Threat Protection in the Windows Security App
Controlled folder access is designed to protect your valuable data from malicious apps and threats, such as ransomware. This feature works by checking apps against a list of known, trusted apps and blocking unauthorized or unsafe apps from accessing or changing files in protected folders.

Protect my PC from viruses | Microsoft Support
Learn how to protect your Windows devices and personal data from viruses, malware, or malicious attacks.

Stay protected with the Windows Security app | Microsoft Support
Summary The Windows Security app is a comprehensive security solution integrated into Windows, designed to protect your device and data from various threats.

Help us secure your account | Microsoft Support
If you see a message that says "Let's protect your account" or "Help us secure your account", it's because we need you to add some information to your account to verify that it's really you trying to sign in.