Change from a 32-bit version to a 64-bit version or vice versa. Activate Windows. Fix Bluetooth problems in Windows. Learn how to install, reinstall, or activate Microsoft 365 or Office 2019 on a PC or Mac.

Learn how to redeem a gift card, code, or Office product key and spend your balance at Microsoft Store online, on Windows, or Xbox.

Use the Office offline installer to install Office 2016 or Office 2013 if you don't have an active Internet connection or you're having problems with slow speed or unreliable connections.

Before you start, make sure that your Windows 11 PC supports Bluetooth. For more info on how to check, see Fix Bluetooth problems in Windows. If you need help adding a device without Bluetooth capabilities, see Add a device to a Windows PC.

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

If your purchase of Office or Microsoft 365 came with a product key, you enter your product key on one of the websites listed below for your product. After you enter your key, you can download and install Office, or you can renew your Microsoft 365 subscription. Tip: Get tech expertise with Business Assist.

If you don’t have access to the account that made the purchase, you’ll need to contact your financial institution for a refund. We provide digital game product refunds as part of a consistent and reliable buying experience.

You can use installation media (a USB flash drive or DVD) to install a new copy of Windows, perform a clean installation, or reinstall Windows. To create installation media, go to the software download website, where you'll find step-by-step instructions.

Get free Windows themes from Microsoft to personalize background, colors and sounds for your PC.

下载并安装或重新安装 Office 2019、Office 2016 或 Office 2013. 如果这是你 第一次 安装 Microsoft 365，则可能需要先执行一些设置步骤。. 展开下面的 “了解详细信息”部分。. 但是如果是重新安装 Microsoft 365，且已兑换了产品密钥并拥有与 Microsoft 365 相关联的帐户，请转 ...