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 improve Windows PC performance if your device is running slowly.

Learn how to update Windows to ensure your device operates smoothly and securely with the latest features.

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

Use Microsoft Teams (work or school) for a Microsoft work or school account or a guest account in Windows 11. Also, find out which version of Teams you’re using.

Learn how to use function VLOOKUP in Excel to find data in a table or range by row. Our step-by-step guide makes vlookup in excel easy and efficient.

The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

Si vous ne parvenez pas à vous connecter à votre compte de messagerie Outlook.com, Hotmail, Live ou MSN, ou si vous ne savez pas comment vous connecter ou vous déconnecter, voici quelques solutions.

Learn how to find your Windows product key for activation or when to use a digital license instead.

Troubleshoot problems you might be having with your mouse or keyboard, or other wireless device in Windows.