If some Windows functions aren't working or Windows crashes, use the System File Checker to scan Windows and restore your files. Though the steps below might look complicated at first glance, just follow them in order, step-by-step, and we’ll try to get you back on track. Run the System File Checker tool (SFC.exe)

If you recently made any changes to your hardware and want to see if your computer now meets the requirements for Windows 11, the easiest way to do that is with the PC Health Check app: If you haven't yet, install the PC Health Check app here.

Some Office 2019, Office 2016, and Office 2013 products come with a product key. If yours did, before installing Microsoft 365 for the first time, sign in with an existing or new Microsoft account and enter your product key at office.com/setup. Redeeming your key is what links your account with Microsoft 365 so you only have to do this once.

Download and install or reinstall Microsoft 365 or Office 2021 on a PC or Mac. Set up Office apps and email on a mobile device. Small business help and learning. Learn how to download and install apps you need from your Microsoft 365 business subscription.

Tip: If you're a small business owner looking for more information on how to get Microsoft 365 set up, visit Small business help & learning. Training: Get started with SharePoint in Microsoft 365. At office.com, sign in to SharePoint, then select the SharePoint tile.

To share a file or folder over a network in File Explorer, do the following: Right-click (or long-press) a file, and then select Show more options > Give access to Specific people. Select a user on the network to share the file with, or select Everyone to give all network users access to the file.

Learn how to add user accounts in Windows 10 and Windows 11. With an account, each person has separate files, browser favorites, and a private desktop.

Help for admins of small businesses. Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

An app for scanning files, such as Windows Scan, available for free from Microsoft Store. The Windows Scan app can help you scan pictures or documents and save them to your PC as JPEG, bitmap, or PNG files. For more info, see Install and use a scanner in Windows. Get Windows Scan.

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.