If you see any of the following issues when your Mac is started from Microsoft Windows, use the steps in this article to reinstall or update your Windows support software:
- One or more screen resolutions are missing or unavailable for your display in Windows.
- You can't adjust the brightness of your built-in display in Windows.
- Your Apple mouse, trackpad, or keyboard isn't working in Windows. (Note that Force Touch isn't designed to work in Windows.)
- You don't hear audio from the built-in speakers of your Mac in Windows.
- The built-in microphone or camera of your Mac isn't recognized in Windows.
Connect and format a USB flash drive
To download and install the latest Boot Camp drivers for Windows, you need an 8 GB or larger USB flash drive. It will be erased, so back up any of its data that you want to keep before continuing.
- Start your Mac from OS X. If you're currently started from Windows, click the Boot Camp icon in the system tray and select the option to restart from OS X.
- Connect the USB flash drive to your Mac.
- Open Disk Utility, which is in the Utilities folder of your Applications folder.
- Select your USB flash drive from drives listed in the Disk Utility window.
Select the drive name, not the volume name that appears beneath it.
- Click the Erase button or tab.
- Choose MS-DOS (FAT) as the format.
- If you see a Scheme menu, choose Master Boot Record as the scheme.
- Click Erase to reformat the drive, then quit Disk Utility.
Download the support software for Windows 8.1 or later
- Make sure that your Mac is connected to the Internet.
- Open Boot Camp Assistant, which is in the Utilities folder of your Applications folder.
- Deselect all options in the Boot Camp Assistant window, except the option to download the latest Windows support software from Apple. Then click continue.
If you don't see this option, choose Action > Download Windows Support Software from the menu bar.
- Make sure that your USB flash drive is shown as the destination drive. Then click Continue and enter an administrator name and password, if prompted. Boot Camp Assistant then downloads the Windows support software to that drive:
- If the assistant doesn't see your USB flash drive, click Go Back and make sure that the drive is connected directly to the USB port on your Mac—not to a display, hub, or keyboard. Disconnect and reconnect the drive, then click Continue.
- If the assistant says that your USB flash drive can't be used, make sure that it's formatted correctly.
- If the assistant says that it can't download the software because of a network problem, make sure that your Mac is connected to the Internet.
- If the assistant says that the Windows support software could not be saved to the selected drive, make sure that your USB flash drive has a storage capacity of at least 8 GB.
Download the support software for Windows 7 or earlier
- Download the appropriate version of Windows support software that works with your Mac and version of Windows.
- Double-click the downloaded ZIP file to expand it.
- Drag the contents of the ZIP file to your USB flash drive, then follow the steps in the next section to install the software.
Install the downloaded Windows support software
After the Windows support software has been downloaded or copied to your USB flash drive, quit Boot Camp Assistant, then follow these steps to install the software.
- Make sure that the USB flash drive is connected to your Mac.
- Choose Apple menu > System Preferences, click Startup Disk, then select the Windows volume from the list of drives:
- Click Restart to start up your Mac in Windows, then log in if prompted.
- Open the Boot Camp folder (or, on newer versions, the WindowsSupport folder) on the USB flash drive. Then double-click Setup (or setup.exe) to begin installation. When you're prompted to allow Boot Camp to make changes, click Yes.
- Click Repair to reinstall or update the Windows support software installed by Boot Camp. If you get a warning that the software you're installing hasn't passed Windows Logo testing, click Continue Anyway.
- After installation finishes, click Yes to restart your Mac.
If a Mac feature still doesn't work after updating the Windows support software, search for your symptom on the Apple support website or Microsoft support website. Some features of your Mac aren't designed to work in Windows.