Windows 10 comes with Windows Defender, a built-in antivirus tool to help protect your PC from malware. With the Anniversary Update, Windows Defender can keep protecting your PC by providing a second layer of protection, even if you install another antivirus.
Windows 10随附Windows Defender，它也是内置的防病毒软件 ，可帮助保护您的PC免受恶意软件的侵害。 使用周年更新 ，即使您安装了其他防病毒软件，Windows Defender也可以通过提供第二层保护来继续保护您的PC。
Generally, you aren’t supposed to run two always-on antivirus programs at once. As such, Windows Defender normally disables itself if you install another antivirus, getting out of the way. But a new option allows Windows Defender to provide some help without providing full real-time protection. You can also manually perform scans of your entire system or specific folders.
通常，您不应该一次运行两个始终在线的防病毒程序。 因此，如果您安装其他防病毒软件，Windows Defender通常会自行禁用，以免干扰。 但是新选项允许Windows Defender提供一些帮助，而无需提供完整的实时保护。 您还可以手动扫描整个系统或特定文件夹。
如何启用定期扫描 (How to Enable Limited Periodic Scanning)
This option is named “limited periodic scanning”. Enable it, and Windows Defender will occasionally perform a scan to check for any malware that your primary antivirus product missed. It’s not enabled by default, and it can’t yet be enabled on managed Windows 10 PCs that are joined to a domain.
此选项称为“有限定期扫描”。 启用它，Windows Defender偶尔会执行扫描以检查主要防病毒产品遗漏的任何恶意软件。 默认情况下未启用它，并且尚未在加入域的托管Windows 10 PC上启用它。
You’ll find this option under Windows Defender’s Settings in the Settings app. To access it, open the Start menu and select “Settings”. Head to Update & Security > Windows Defender and enable the “Limited Periodic Scanning” feature.
您可以在“设置”应用程序中Windows Defender的“设置”下找到此选项。 要访问它，请打开开始菜单，然后选择“设置”。 转到更新和安全> Windows Defender并启用“定期扫描”功能。
You can only enable this feature if you’re using another antivirus program. If you haven’t installed another antivirus program, Windows Defender is already helping protect your computer with both real-time and scheduled system scans.
仅在使用其他防病毒程序时才能启用此功能。 如果您尚未安装其他防病毒程序，则Windows Defender已通过实时和计划的系统扫描来帮助保护您的计算机。
Windows Defender will automatically be updated with the latest antivirus applications through Windows Update.
Windows Defender将通过Windows Update自动更新为最新的防病毒应用程序。
如何执行手动扫描 (How to Perform a Manual Scan)
You can also perform a manual scan of your entire computer or specific folders with Windows Defender, even if you’re using another antivirus program. Windows Defender can provide a second opinion that might catch something missed by your normal antivirus program.
您也可以使用Windows Defender对整个计算机或特定文件夹执行手动扫描，即使您正在使用其他防病毒程序也是如此。 Windows Defender可以提供第二种意见，可能会捕获您的常规防病毒程序遗漏的内容。
To do this, launch the Windows Defender interface. You can do this by heading to Settings > Update & Security > Windows Defender > Open Windows Defender, clicking the new shield-shaped Windows Defender icon in the notification area and selecting “Open”, or launching Windows Defender from the Start menu.
为此，请启动Windows Defender界面。 您可以通过以下方法执行此操作：转到“设置”>“更新和安全性”>“ Windows Defender”>“打开Windows Defender”，单击通知区域中新的盾形Windows Defender图标，然后选择“打开”，或者从“开始”菜单启动Windows Defender。
Assuing you’ve set up limited periodic scanning, you’ll see a message saying “Windows Defender Periodic Scanning is ON”, but that real-time protection is handled by another antivirus program.
假设您已设置了有限的定期扫描，则会看到一条消息，指出“ Windows Defender定期扫描已启用”，但是实时保护由另一个防病毒程序处理。
To perform a manual scan, select “Quick” for a fast scan, “Full” for a deep system scan, or “Custom” for a scan of only the folders your choose. Click “Scan Now” to start the scan.
要执行手动扫描，请选择“快速”进行快速扫描，选择“完整”进行深度系统扫描，或选择“自定义”仅扫描您选择的文件夹。 单击“立即扫描”开始扫描。
Windows Defender should automatically be updated with the latest antivirus definitions, but you can click the “Update” tab here and manually check for updates before scanning, if you like.
Windows Defender应该自动使用最新的防病毒定义进行更新，但是您可以根据需要单击此处的“更新”选项卡，然后在扫描之前手动检查更新。
如果Windows Defender检测到恶意软件… (If Windows Defender Detects Malware…)
If malware is detected through either type of scan, you’ll see a notification saying potentially harmful software was detected.
如果通过任一类型的扫描检测到恶意软件，您将看到一条通知，指出检测到潜在有害的软件。
Click the notification and Windows Defender will inform you of the malware it found and allow you to choose what to do with it.
单击该通知，Windows Defender会将发现的恶意软件通知您，并允许您选择如何处理。
You can view a list of malware found by Windows Defender through the History tab in the Windows Defender window.
您可以通过Windows Defender窗口中的“历史记录”选项卡查看Windows Defender发现的恶意软件列表。
If you regularly notice malware getting through your primary antivirus and being caught be Windows Defender, you should probably switch to another antivirus program.
如果您经常发现恶意软件通过主要防病毒程序并被Windows Defender捕获，则您可能应该切换到另一个防病毒程序 。