Learn how to troubleshoot Windows activation errors. Browse common activation errors and learn what you can do to fix them.

Learn how to troubleshoot when the camera is not working in Windows or you see errors 0xA00F4244 or 0x200F4244.

If you're trying to add your Outlook.com account to Outlook or another mail app, you might need the POP, IMAP, or SMTP settings. You can find them below or by viewing them in your Outlook.com settings.. Outlook and Outlook.com may be able to detect your account's mailbox settings automatically, but for other non-Microsoft accounts, you may need to contact your email provider for their settings.

Learn how to change the refresh rate for your display in Windows to determine how smoothly motion appears on your screen.

Learn how to access Windows device security settings in Windows Security to help protect your device from malicious software.

Learn how to use antivirus protection in Windows Security to protect your Windows PC against malware, viruses, and other threats.

Updates to the default screen and sleep settings now help you use energy more efficiently and extend battery life. You can find efficiency settings in Windows 11 at Settings > System > Power & battery.. For a guided walkthrough of how each of the power and battery settings can improve your device's performance, click the button to open the Get Help app:

Learn how to change the power mode on your Windows PC to preserve your battery, limit notifications, and background activity.

了解如何使用产品密钥或数字许可证激活 Windows、检查激活状态，以及链接Microsoft 帐户。

If you already have an account signed in to OneDrive and you want to add or remove another account, you’ll do that in OneDrive Settings.