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Review the warranty terms, check your warranty status, and learn about the protection plans for your Microsoft device or accessory.

Smart App Control adds significant protection from new and emerging threats by blocking apps that are malicious or untrusted. Smart App Control also helps to block potentially unwanted apps, which are apps that may cause your device to run slowly, display unexpected ads, offer extra software you didn't want, or do other things you don't expect.

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当你首次在 Android 上登录到Microsoft Defender 时，我们将引导你完成几个从设置 Web 保护开始的简单步骤。 在此过程中，我们将要求你授予 Defender 执行两项操作的权限：在后台运行并使用辅助功能服务。

查找 Windows 7 或 Windows 8.1 的产品密钥. 卸载或重新安装 Windows 7 或 Windows 8.1 时，通常需要产品密钥。 通常，如果购买的是实物 Windows 拷贝，产品密钥应该在标签上或者在 Windows 随附包装盒中的卡上。

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使用 Authenticator 作为登录的一种方式. 如果已为帐户启用无密码、双重或多重身份验证，请使用以下步骤登录：

选择正确的链接以获取有关取消 Microsoft 365、Microsoft Copilot Pro 或 Xbox 订阅的帮助。 对于所有其他订阅，请按照以下 取消其他Microsoft订阅部分中的步骤操作。. 取消 Microsoft 365、 Copilot Pro 或 Xbox 订阅