Windows 11/10 允许您使用Windows 安全^{(Windows Security)}性禁用或启用对潜在有害应用程序^{(Potentially Unwanted Applications)}( PUA ) 的保护，也称为潜在有害程序^{(Potentially Unwanted Programs)}( PUP ) 。此设置在Windows 10^{(Windows 10)} 2004 及更高版本中默认禁用。

潜在的不需要的应用程序^{(Potential Unwanted Applications)}（PUA或PUP）是基于声誉和研究驱动识别的威胁分类。它们通常是Crapware或Bundleware，以及您确实不希望在系统上安装的此类软件。

您应该知道PUP 或 PUA^{(PUP or PUA)}不是病毒或勒索软件，但它们会被标记为不需要，因为它们可能很烦人。PUA的特征行为^{(characteristic behavior of PUA)}如下：

• 提供其他软件作为广告捆绑
• ^(Install)未经您的同意安装软件
• 当他们发现保护Windows 10^{(Windows 10)} PC的安全软件时，主动尝试逃避安全产品的检测或采取不同的行为。

Windows 11/10中可能不需要的应用程序^{(Unwanted Applications)}保护

Windows 安全中心具有基于信誉的保护^{(Reputation-based protection)}，可帮助保护您的 PC 免受可能不需要的应用程序的侵害。Windows 11/10中打开或关闭可能不需要的应用程序^{(Unwanted Applications)}保护：

1. 使用搜索^(Search)，打开Windows 安全^{(Windows Security)}
2. 选择应用和浏览器控制
3. 找到^(Locate)基于信誉的保护设置。
4. 开启或关闭^(Off)潜在不受欢迎的应用程序阻止开关
5. 选择是否要阻止^(Block)应用程序、阻止^(Block)下载或两者。

完成此操作后，您的Windows计算机将受到保护，防止潜在的不需要的应用程序^{(Potentially Unwanted Application)}下载。

PUA保护将隔离PUP文件并阻止它们在满足以下条件之一时运行：

1. 正在从浏览器扫描文件
2. 该文件具有 Web 标记集
3. 该文件位于 %downloads% 文件夹中
4. 或者，如果 %temp% 文件夹中的文件。

PUA 保护^{(PUA Protection)}与SmartScreen 有何不同

虽然听起来它们很相似，但事实并非如此。虽然SmartScreen 可以防止恶意网站和下载，但PUA会阻止下载可能导致意外行为的低信誉应用程序。前者更关注网站、勒索软件、病毒，而后者则希望立即阻止下载。

您还可以在 Windows 11/10 中使用组策略、注册表或 PowerShell 打开或关闭 PUP 保护。^{(turn on or off PUP Protection using Group Policy, Registry, or PowerShell)}

这篇文章将向您展示如何在 Edge 浏览器中启用可能不需要的应用程序保护^{(enable Potentially Unwanted Application protection in the Edge browser)}。

相关阅读^{(Related read)}：什么是潜在不需要的修改 (PUM)？预防、识别^{(Identification)}、消除^(Removal)。

Enable Potentially Unwanted Applications protection in Windows 11/10

Windowѕ 11/10 allows you to disablе or enablе protection against Potentially Unwanted Applications (PUA) also known as Potentially Unwanted Programs (PUP) using Windows Security. This setting is disabled by default in Windows 10 2004 and later.

Potential Unwanted Applications (PUA or PUP) is a threat classification based on reputation and research-driven identification. They are typically Crapware or Bundleware, and such software that you really do not want on your system.

You should know that PUP or PUA is not a virus or ransomware, but they are marked as Unwanted because they can be annoying.  The characteristic behavior of PUA is as follows:

• Offer other software as an advertising bundle
• Install software without your consent
• Actively tries to evade detection by security products or differently behave when they find a security software guarding the Windows 10 PC.

Potentially Unwanted Applications protection in Windows 11/10

Windows Security has Reputation-based protection that can help protect your PC from potentially unwanted applications. To turn on or off Potentially Unwanted Applications protection in Windows 11/10:

1. Using the Search, open Windows Security
2. Select App & browser control
3. Locate Reputation-based protection settings.
4. Toggle On or Off Potentially unwanted app blocking switch
5. Select if you want to Block apps, Block downloads, or both.

Once you have done this, your Windows computer will be protected against Potentially Unwanted Application download.

PUA protection will quarantine the PUP file and prevent them from running if it meets one of the following conditions:

1. The file is being scanned from the browser
2. The file has Mark of the Web set
3. The file is in the %downloads% folder
4. Or if the file in the %temp% folder.

How is PUA Protection different from SmartScreen

While it may sound that they are similar, but they aren’t. While SmartScreen protects from malicious sites and downloads, PUA blocks downloads of low reputation apps that might cause unexpected behaviors. The former is more concerned about sites, ransomware, virus while the later wants to prevent the downloads instantly.

You can also turn on or off PUP Protection using Group Policy, Registry, or PowerShell in Windows 11/10.

This post will show you how to enable Potentially Unwanted Application protection in the Edge browser.

Related read: What is Potentially Unwanted Modification (PUM)? Prevention, Identification, Removal.

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