If some Windows functions aren't working or Windows crashes, use the System File Checker to scan Windows and restore your files. Though the steps below might look complicated at first glance, just follow them in order, step-by-step, and we’ll try to get you back on track.

Updates for Windows 11, version 24H2. Windows 11 is a service, which means it gets better through periodic feature updates. We take a phased and measured approach to rolling out every feature update.

System File Checker is a utility in Windows that checks for problems with files on your computer. To run it, follow these steps: Make sure you've installed the latest updates for Windows, and then restart your machine. To find out more, read Update Windows.

Windows Security Update. This update provides latest updates for Windows Security platform, which is comprised of the Windows Security app and its underlying service. To obtain the current version of Windows Security app, please run powershell command below: Get-AppPackage Microsoft.SecHealthUI.

The easiest way to see if a device meets the requirements for Windows 11 after making hardware changes to the device is with the PC Health Check app: Download and install the PC Health Check app. The PC Health Check app can be downloaded from the following link: Right-click on the Start menu and select Search.

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.

Learn how to use Manage and Optimize Drives to keep your disk and data drives defragmented and at top performance in Windows.

Get to know your way around Windows 11, from where to search to how to stay organized. Watch the video and read tips about new features.

For Windows 10. If your keyboard does not have a Scroll Lock key, on your computer, click Start > Settings > Ease of Access > Keyboard. Click the Use the On-Screen Keyboard button to turn it on. When the on-screen keyboard appears on your screen, click the ScrLk button.

Virus & threat protection in Windows Security helps you scan for threats on your device. You can also run different types of scans, see the results of your previous virus and threat scans, and get the latest protection offered by Microsoft Defender Antivirus. Under Current threats you can: