What drivers do and why you need to install them

A driver is software that tells your operating system how to talk to a piece of hardware — a printer, graphics card, network adapter, or external device. When you plug in a new device or buy a computer, the operating system may not know how to use that hardware without the right driver. Installing a driver is how you give your system the instructions it needs to recognize and control the device.

Most of the time, Windows and Mac handle this automatically. When you connect a printer or external hard drive, your system finds and installs the driver in the background without you doing anything. But sometimes — especially with older devices, specialized equipment, or less common hardware — you need to install the driver yourself. This guide walks you through how to do that on both Windows and Mac.

Key Takeaways

  • Windows and Mac automatically install drivers for most common devices, so check Device Manager (Windows) or System Information (Mac) before assuming you need to install one yourself.
  • Find the correct driver by going to the manufacturer's website, searching for your exact device model, and downloading the version that matches your operating system and system type (32-bit or 64-bit).
  • On Windows, run the installer file the manufacturer provides, or use Device Manager to point to the driver file if the installer doesn't work.
  • On Mac, most drivers are installed automatically or come built-in; if you need to install one manually, the manufacturer's instructions will guide you through the specific steps for that device.
  • After installation, restart your computer and check Device Manager or System Information to confirm the device is recognized and working.

How to check if you actually need to install a driver

Before you download anything, verify that the driver isn't already installed. On Windows, open Device Manager by right-clicking the Start button and selecting "Device Manager" from the menu. Look for your device in the list — if it appears with a normal icon and no warning symbol, the driver is already installed and working.

On Mac, click the Apple menu, select "About This Mac", then click "System Report". Look for your device under the relevant category (USB, Printers & Scanners, or Network). If it appears and shows no error status, the driver is installed. If you see a device with a yellow exclamation mark on Windows, or if the device doesn't appear at all, then you need to install or update the driver.

Finding the correct driver for your device

The most reliable source for a driver is the manufacturer's website. Go to the support or downloads section and search for your exact device model. This is important: downloading a driver for a similar model or from a third-party site can cause problems. Stick with the official manufacturer.

When you find the driver, make sure it matches your setup. Check three things: the device model (exact match), your operating system (Windows 10, Windows 11, Mac, etc.), and your system type. To find your system type on Windows, right-click "This PC" or "My Computer", select "Properties", and look for "System type" — it will say either 32-bit or 64-bit. On Mac, go to Apple menu > About This Mac and check the "Chip" or "Processor" line. Download the driver file that matches all three.

Installing a driver on Windows

Most Windows drivers come as an installer file with a .exe extension. Download the file, then double-click it to run the installer. Follow the on-screen prompts — usually you'll see a welcome screen, agree to terms, choose an installation location, and then click "Install". The installer will copy the driver files to your system and register them with Windows. When it finishes, restart your computer.

If the manufacturer provides a .zip file instead of an .exe, extract the contents to a folder. Then open Device Manager, find your device (it may show an error or unknown device), right-click it, and select "Update driver". Choose "Browse my computer for driver software", navigate to the folder where you extracted the files, and click "Next". Windows will scan the folder and install the driver.

After the restart, open Device Manager again and confirm your device now appears with a normal icon and no warning symbol. If it still shows an error, check the manufacturer's website for troubleshooting steps specific to that device.

Installing a driver on Mac

Most hardware works on Mac without any manual driver installation. The operating system includes drivers for common devices like printers, external drives, and keyboards. When you connect a new device, Mac automatically recognizes it and installs what it needs in the background.

If the manufacturer provides a driver for Mac, they will usually supply an installer package with a .pkg or .dmg extension. Double-click the file to open it. For a .pkg file, follow the installer prompts to complete the installation. For a .dmg file, it will mount as a virtual disk — double-click the installer inside, follow the prompts, then eject the disk when done. Restart your Mac after installation.

Some manufacturers provide only instructions rather than an automated installer. In that case, read their documentation carefully — they may ask you to place files in a specific system folder or run a command in Terminal. Follow their exact steps. If you're unsure, contact the manufacturer's support before proceeding.

What to do if the driver won't install

On Windows, the most common problem is downloading the wrong version. Double-check that the driver matches your system type (32-bit or 64-bit) and operating system version. If you downloaded the wrong one, uninstall it through Control Panel > Programs > Programs and Features, restart, then download and install the correct version.

If the installer fails or gives an error, try running it as administrator. Right-click the installer file, select "Run as administrator", and try again. If that doesn't work, restart your computer in Safe Mode with Networking (restart, press F8 or Shift+F8 repeatedly before Windows loads, select Safe Mode with Networking), then try the installer again. Safe Mode loads only essential drivers and services, which sometimes allows a problematic installer to work.

On Mac, if an installer fails, restart your Mac and try again. If it still fails, check the manufacturer's support page for known issues with your Mac model or operating system version. Some older devices don't have drivers available for the latest Mac OS versions, and in those cases you may need to use an older Mac or find an alternative device.

Updating drivers you already have

Manufacturers release driver updates to fix bugs, improve performance, or add compatibility with new operating system versions. On Windows, open Device Manager, right-click your device, and select "Update driver". Choose "Search automatically for updated driver software" and Windows will check the manufacturer's website. If an update is available, it will download and install it automatically.

On Mac, driver updates usually come through the standard Software Update process. Click the Apple menu, select "System Settings" (or "System Preferences" on older versions), then "General" > "Software Update". Mac will check for and install any available driver updates along with operating system updates. You can also check the manufacturer's website to see if they offer driver updates outside of the standard Mac update process.

Frequently Asked Questions

Do I need to uninstall the old driver before installing a new one?

On Windows, the installer usually replaces the old driver automatically, so you don't need to uninstall first. On Mac, the same is true. However, if you're troubleshooting a problem, uninstalling the old driver and restarting before installing a fresh copy can sometimes help. Go to Control Panel > Programs > Programs and Features on Windows, find the driver, and click Uninstall.

What if my device still doesn't work after I install the driver?

Restart your computer first — many driver issues resolve after a restart. Then check Device Manager (Windows) or System Information (Mac) to confirm the device is recognized. If it shows an error code, search the manufacturer's website for that specific error code. If the device isn't recognized at all, try a different USB port or cable, as the problem may be hardware rather than software.

Is it safe to download drivers from websites other than the manufacturer?

No. Third-party driver sites can bundle malware or outdated versions that cause problems. Always download from the official manufacturer's website. If you can't find the manufacturer online, the device may be too old to have current drivers available, and you may need to replace it or use it with an older operating system.

Can I install a driver for a device that's not connected to my computer?

On Windows, yes — you can install the driver ahead of time, and it will be ready when you connect the device. On Mac, it's usually not necessary because Mac installs drivers automatically when you connect the device. If you want to install in advance on Mac, follow the manufacturer's instructions, but in most cases you can wait until you plug in the device.

What does it mean if Device Manager shows a yellow exclamation mark?

A yellow exclamation mark means Windows recognizes the device but doesn't have the correct driver installed, or the driver is corrupted. Right-click the device and select "Update driver", then choose "Search automatically for updated driver software". If that doesn't work, uninstall the device, restart your computer, and Windows will attempt to reinstall the driver from scratch.