Locate your product key for Windows 10 or Windows 11. Depending on how you got your copy of Windows 10 or Windows 11, you'll need either a 25-character product key or a digital license to activate it.

Give your PC a Fresh Start. Resetting your PC lets you perform a clean reinstallation and update of Windows while keeping your personal data and most Windows settings intact. In some cases, a clean installation may improve your device's performance, security, browsing experience, and battery life.

If you receive a phone call claiming to be from Microsoft, or see a pop-up window on your PC with a fake warning message and a phone number to call and get your “issue” fixed, it’s better to be safe and not click any links or provide any personal information.

Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

If you get an error code while downloading and installing Windows updates, the Update Troubleshooter can help resolve the problem. Select Start > Settings > System > Troubleshoot > Other troubleshooters. Next, under Most frequent, select Windows Update > Run.

Cancel your Microsoft subscription. Select the correct link for help with canceling a Microsoft 365, Microsoft Copilot Pro or an Xbox subscription. For all other subscriptions, follow the steps in the Cancel other Microsoft subscriptions section below.

Microsoft Teams （免费版）. 微软在线订购协议 . 本 Microsoft Teams （免 费版 ） 微 软 在线 订 购 协 议 是 您代 表 的 实 体与 （ 以 下 简 称 “ 微 软 ” 、 “ 我们 ” 或 “ 我 们的 ” ） 之 间达 成 的 协 议 ， 或者如果您未指定与订购或续签相关的实体，则本协议是 Microsoft Operations Pte Ltd. 与您个人（以 ...

Turn Windows Security on or off. Security Windows 10. When you get a new device and start up Windows 10 for the first time, the antivirus protection that comes installed with the device is your default security app. However, Windows Security is pre-installed and ready for you to use at any time.

Getting the most out of Microsoft Rewards. Here are some best practices for earning Microsoft Rewards points so you can redeem them for gift cards, games, sweepstakes, nonprofit donations, and more.

Cancel Microsoft 365 with the help of a support advocate. If you're thinking of cancelling a Microsoft 365 subscription or need help switching to another plan that better meets your needs, support agents are available to help. Request a call back.