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 11 lets you quickly check your network connection status. Select the Start button, then type settings.Select Settings > Network & internet.The status of your network connection will appear at the top.

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If you can’t locate a lost file from your backup, then you can use Windows File Recovery, which is a command line app available from the Microsoft Store.Use this app to try to recover lost files that have been deleted from your local storage device (including internal drives, external drives, and USB devices) and can’t be restored from the Recycle Bin.

使用 vlookup、hlookup 和其他函数（如 index 和 match）根据您输入的值搜索和查找数据。 本文将让您快速回顾 vlookup，然后链接到更多内容。

To access your sign-in options, go to Start > Settings > Accounts > Sign-in options.. Or just select this button: Go to Sign-in options. Change or manage your password or PIN. To change your password or PIN, go to Start > Settings > Accounts > Sign-in options. Select PIN (Windows Hello), and then select Change PIN.

To keep an area of a worksheet visible while you scroll to another area of the worksheet, go to the View tab, where you can Freeze Panes to lock specific rows and columns in place, or you can Split panes to create separate windows of the same worksheet.

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This article explains how you can get or create a digital signature for use in Office documents. To learn more about how to use them in Office documents, see Add or remove a digital signature in Office files.. What is a digital signature?

On the General tab, under Home page, enter the URL of the site you want to set as a homepage.You can add more than one URL. Or, to add the site you're currently viewing, select Use current.If you add more than one URL, put each URL on its own line.