Microsoft Defender is a new security app that helps protect you and your family across all your devices; Windows, Android, Mac, and iOS.

Contact Microsoft Support. What's new. Surface Pro; Surface Laptop; Surface Laptop Studio 2

Describes how to use the System File Checker tool to troubleshoot missing or corrupted system files in Windows 8.1, Windows 8, Windows 7 or Windows Vista.

Learn how to get ready for the Windows 11 upgrade, from making sure your device can run Windows 11 to backing up your files and installing Windows 11.

Learn how to improve Windows PC performance if your device is running slowly.

Learn how to connect to a Wi-fi network in Windows and manage your current network connections.

This article is for Outlook.com. If you're using Outlook for Windows, see Fixes or workarounds for recent issues in Outlook for Windows.. If you're having problems accessing Outlook.com, you can see the status of Microsoft Office Online Services at the Service Health portal.. If you're having problems sending or receiving email, read how to Fix Outlook.com email sync issues.

Learn about the recovery options in Windows. Find out how to reset your PC, go back to a previous version of Windows, or use media to reinstall Windows.

Use the Windows Settings app to change your desktop backgrounds and colors.

Safe mode starts Windows in a basic state, using a limited set of files and drivers. If a problem doesn't happen in safe mode, this means that default settings and basic device drivers aren't causing the issue. Observing Windows in safe mode enables you to narrow down the source of a problem, and can help you troubleshoot problems on your PC.