How do I boot Windows from another computer?

Buying a new computer can be fun, until you have to slog through migrating all your old apps, preferences, and files. Wouldn't it be easier if you could just pop your old hard drive into the new PC and pick up where you left off?

Windows 7 introduced driver conflicts that resulted in a blue screen as soon as the computer booted. Microsoft's sysprep(Opens in a new window) tool could sometimes help, but it wasn't really meant for this purpose, and it had its own issues. You were almost always better off doing a clean install. Since Windows 10, the OS is much better about handling these conflicts. It's technically possible, though it comes with some caveats.

When you throw an existing Windows installation at a new PC, it'll perform its first-time setup as if it were a new computer, grab drivers for your new hardware, and hopefully drop you onto the desktop without much trouble. You'll have to do a few things yourself, but overall, it should work.

I moved my drive from an AMD-based machine to an Intel/Nvidia machine with barely a hiccup. Windows Update was even able to download new patches. But that's not to say you won't run into any problems. This may all vary from PC to PC, and you never know what driver conflicts or performance issues may lay underneath the surface of a seemingly fine setup.

All told, I would still recommend doing a clean install if you're migrating permanently to a new machine, but if you need something quick and dirty—like if your old PC dies and you need to access some data from your old installation—this should work well enough.

Back Up the Entire Drive

Before making any substantial changes, it's always a good idea to back up your data—and that goes double when you're messing with hard drives. If you have a backup tool you really like, go ahead and use that. However, for this particular case, I recommend cloning the entire drive. That way, if something goes wrong, you can restore an exact image of the original drive and try a different approach.

Alternatively, if your new PC takes a different kind of drive than your old PC—say, you're migrating from a PC with a 2.5-inch drive to one with an M.2 slot—you can clone the old drive to a new drive with the correct form factor, then plug that drive into your new PC.

Note that this may mean buying a new SSD and plugging it in with a USB-to-M.2 SATA(Opens in a new window) or USB-to-M.2 NVMe(Opens in a new window) enclosure in order to clone it. Do some research on which type of drives your new PC supports before buying.

Move Your Drive to the New PC

Once your drive has been safely backed up, it's time to swap it into your new PC, removing it from the external enclosure first (if you used one). You may have to look up instructions for opening up your specific machine and installing new storage.

Then, turn your PC on. Chances are, it'll try to boot from the new drive automatically, but if not, you may need to press a key at startup to enter the BIOS settings, like F2 or Delete, and change the boot order.

Once the PC finds the right drive, you should be greeted with the Windows logo with the spinning wheel. It'll likely say something like "Getting Devices Ready," and you'll have to let it do its thing—in my experience, this is pretty quick, though others have noted that it could require multiple restarts.

Install New Drivers (and Uninstall Old Ones)

Windows will likely install a lot of the necessary drivers for you, especially once you connect your new PC to the internet. You may notice some flickering as it downloads the display drivers, so give it some time to go through its process. You may also find you need to download some drivers manually, if Windows doesn't do so on its own or downloads generic drivers instead of manufacturer-supplied ones.

To be safe, I recommend heading to your PC manufacturer's website and downloading the chipset, audio, and other drivers yourself. If you built the computer, go to the motherboard manufacturer's website instead. You can also head to Nvidia, AMD, or Intel's website for graphics drivers, though Windows installed the non-generic versions for me without my intervention.

Finally, if you want to keep things clean, you can uninstall the old drivers left on your system by searching for "Add or Remove Programs" from the Start menu. For graphics drivers, you may want to use a tool like DDU(Opens in a new window) to really clean them out.

Recommended by Our Editors

For everything else, search the Start menu for Device Manager in the Control Panel, click View > Show Hidden Devices, and right-click devices you no longer use to uninstall their drivers.

Re-Activate Windows

There's one last hitch to this process: when you toss your drive into a new computer, Windows will recognize that the hardware has changed, and potentially—depending on the type of license you have—de-activate itself.

If this setup is temporary, and you're only using it to grab a few things off your old PC, you don't need to worry about activation—Windows should keep working as normal, with an activation watermark in the corner and a few features disabled. If you plan on using this setup permanently, though, you should re-activate Windows.

You can try entering the same product key you used before, but this may fail if you have an OEM license that isn't meant to migrate to new hardware. I recommend trying the activate-by-phone option, though, as sometimes that will succeed when online activation fails.

Again, this whole thing is not a foolproof process—there are many tiny things that could trip things up, so you may have to do a bit of troubleshooting if something doesn't work properly. And even then, there's no guarantee you'll be getting optimal performance if the system isn't configured properly for your new hardware.

If you can take the time, a clean install is best—but when you need to get up and running right now, it's nice to know Windows 10 has streamlined the process enough to make it usable.

Like What You're Reading?

Sign up for Tips & Tricks newsletter for expert advice to get the most out of your technology.

This newsletter may contain advertising, deals, or affiliate links. Subscribing to a newsletter indicates your consent to our Terms of Use and Privacy Policy. You may unsubscribe from the newsletters at any time.