How to open the Camera app in Windows. To open up your webcam or camera, select the Start button, then select All apps, and then select Camera in the list of apps. If you have multiple cameras, you can switch between them by selecting Change Camera at the top right once the Camera app is opened.. Open Camera

Learn how to change Microsoft account email address or phone number using aliases to sign into your Microsoft account.

Learn how to personalize a Windows lock screen with a background photo, slideshow, or app notifications.

Get free Windows themes from Microsoft to personalize background, colors and sounds for your PC.

更改或删除第一页的页眉或页脚 双击页眉或页脚区域（靠近页面的顶部或底部）以打开“页眉和页脚”选项卡。

Learn how to troubleshoot problems updating Windows. Find answers to common questions and issues installing Windows updates.

Learn how to use the Settings app to view and change display settings in Windows.

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Learn how to use antivirus protection in Windows Security to protect your Windows PC against malware, viruses, and other threats.