Learn how to remove malware from your PC. Use Microsoft Defender Antivirus in Windows 10 or Windows 11 to scan your PC for malware, viruses, or other threats.

Windows 10. To turn off your PC in Windows 10, select the Start button, select the Power button, and then select Shut down.

如果你正在使用 Windows 电脑，并且想要在电脑设备上显示来自其他屏幕的应用程序和内容，则需考虑将设备屏幕镜像或投影到电脑。 请注意，需要支持 Miracast 的设备。 下面介绍如何将另一个屏幕或项目镜像到你的电脑。

How to freeze panes in Excel to keep rows or columns in your worksheet visible while you scroll, or lock them in place to create multiple worksheet areas.

Learn how to find which version of Windows operating system your PC is running and device specifications.

Change default programs in Windows. Windows 10 Windows 11. Windows 11 Windows 10. Select Start > Settings > Apps > Default apps. To change the default app, you can do either of the following: Set a default for a file type or link type. In the search bar, enter the file type or link type you want, then select it from the list of results.

If you have Visio Plan 2 or a non-subscription version such as Visio Professional or Visio Standard 2021 , 2019, or 2016 you can install and use the desktop app.

Update Surface devices and Windows. Download the latest drivers and firmware updates to keep your Surface devices performing their best.

Refunds are typically issued for requests meeting the following criteria: Requests are made within 14 days of the purchase date. Requests are for games in which you haven’t accumulated a significant amount of play time. Note As a limited exception, digital game products may be eligible for a refund within 30 days if you’re unsatisfied with ...

You can insert a drop-down list of valid entries (also called a drop-down menu or drop-down box) in Excel to make data entry easier, or to limit entries to certain items that you define.