How to update Windows (and what to do if an update fails)

These steps are for Windows 11. On Windows 10, Windows Update is under Settings > Update & Security. Windows 10 itself no longer gets regular updates; see Windows 10 support has ended.

Steps

1. Check for updates. Select Start > Settings > Windows Update, then Check for updates.
2. Install what it finds. If updates are available, select Download & install.
3. Restart when asked. Many updates only finish after a restart. Save your work, close your programs, then select Start > Power and choose Update and restart.
4. Check again. After the restart, select Check for updates once more. There may be more.

If an update fails

Try these in order, and check for updates again after each one.

1. Run the troubleshooter. Select Start > Settings > System > Troubleshoot > Other troubleshooters. Next to Windows Update, select Run and follow the instructions.
2. Check power and internet. The PC should be plugged in and connected. Updates need a steady connection.
3. Unplug extra devices. Remove external drives, docks and other hardware you don't need for basic use, then try again.
4. Check the date and time. Select Start > Settings > Time & language > Date & time and turn on Set time automatically. A wrong date can stop updates.
5. Free up space. Low disk space is a common cause. Follow how to free up disk space.
6. Use an administrator account. Some updates need one. If yours isn't an administrator, ask the person who set the computer up to install the updates.

Microsoft's page lists deeper fixes after these, such as clearing the Windows Update cache. Before you try them, back up your personal files: Microsoft says to do that first. See how to back up a Windows PC.

Why bother

Updates close security holes and fix problems. In Microsoft's words, they keep your device running smoothly and securely.