Note: If it’s been fewer than 10 days since you upgraded to Windows 10, your previous version of Windows will be listed as a system file you can delete.If you need to free up drive space, you can delete it, but keep in mind that you'll be deleting your Windows.old folder, which contains files that give you the option to go back to your previous version of Windows.

借助提示和资源自行进行疑难解答以解决 Windows 蓝屏错误；如果你需要更多帮助，请联系 Microsoft 支持。 如果某个严重问题导致 Windows 意外关闭或重启，则会出现蓝屏错误（有时也称为黑屏错误或终止代码错误）。

If you are planning to use Teams free or if you were a guest in an org, you can connect and collaborate by downloading and installing another version of Microsoft Teams (work or school) and signing in with your Microsoft account or the guest account where the invite was sent to.

The easiest way to get language packs for Windows 8.1 and Windows RT is to download and install them using the Language Control Panel. Download and install additional languages to view menus, dialog boxes, and other user interface items in your preferred language.

Windows Media Player is available for Windows-based devices. Use this table to find the right version of the Player for your system. (If you've got a Mac, you can download Windows Media Components for QuickTime to play Windows Media files.)

新しい Windows 10 PC にプリインストールされている Office をライセンス認証する、または新しいプロダクト キーを使用する方法について説明します。 アクティブ化されていない Microsoft 365 アプリを起動すると、Microsoft 365 にサインインするように求められます。

Windows Hello 是登录到 Windows 设备的一种更个性化、更安全的方式。 在 Windows Hello 中，你可以使用面部识别、指纹或 PIN 登录，而不是使用密码。 这些选项有助于更轻松地登录电脑，因为你的 PIN 仅与一台设备相关联，并且它已使用 Microsoft 帐户进行 ...

了解如何使用電腦健康情況檢查應用程式，協助改善您的裝置效能。 使用 Microsoft 帳戶登入或建立新帳戶，以跨裝置同步您的喜好設定，例如密碼、Microsoft Edge 瀏覽器設定 (例如我的最愛和閱讀清單、佈景主題等等)。

Note: If you start to play a DVD or VCD in the Player Library, the Player automatically switches to Now Playing mode. The Blu-ray Disc format is not supported in Windows Media Player. To play a Blu-ray Disc, you need to use a non-Microsoft program that supports Blu-ray playback and a device capable of reading Blu-ray Discs.

Now, you can use apps to share files and photos right from File Explorer. Select the files you want to share, go to the Share tab, select the Share button, and then choose an app. For more info on sharing options, see Share files in File Explorer.