How to Install Windows from a USB Flash Drive
How to Install Windows from a USB Flash Drive
This wikiHow teaches you how to use a USB flash drive to install a version of the Windows operating system onto a Windows computer. Using a USB flash drive is useful when your computer doesn't have a CD drive or when you don't have an operating system installation disc.
Steps

Creating the Installation Flash Drive for Windows 10

Check the computer's architecture number. Before you download an installation tool for your preferred operating system, you'll need to know whether the computer on which you want to install Windows runs a 32-bit system or a 64-bit system. Make sure that you do this on the computer on which you're going to install Windows.

Make sure that you have at least a 8-gigabyte flash drive. Windows needs at least eight gigabytes of space for its installation file. Flash drives are fairly cheap; you can get a 16-gigabyte flash drive—twice times the space you need—for less than $10.

Plug the flash drive into your computer. The flash drive should fit into one of your computer's rectangular USB ports.

Format the flash drive to FAT32 or exFAT. When formatting your flash drive, click the File system drop-down box, then click FAT32 or exFAT in the drop-down menu. Formatting your flash drive will erase everything on it.

Download the Windows installation tool. Open the Windows 10 download page, then click Download tool now at the bottom of the page.

Run the installation tool. Double-click the "MediaCreationTool" EXE file, click Yes when prompted, accept any terms, and fill out any on-screen sections until you get to the installation section. As part of the installation tool, you'll be prompted to select a language, an edition of Windows, and an architecture for the setup process. Make sure to use the same architecture here as you found in step two of this part.

Create your bootable flash drive. Once the installation section of the Media Creation Tool window opens, click the "Create installation media" checkbox, click Next, select your computer's language, edition, and architecture, click Next, click the flash drive's name, and click Next.

Wait for the flash drive setup to complete. This may take several minutes. Once all of the setup files have downloaded (or pasted) into the flash drive, you can proceed with changing your computer's boot order.

Creating the Installation Flash Drive for Windows 8.1

Check the computer's architecture number. Before you download an installation tool for your preferred operating system, you'll need to know whether the computer on which you want to install Windows runs a 32-bit system or a 64-bit system. Make sure that you do this on the computer on which you're going to install Windows.

Make sure that you have at least a 4-gigabyte flash drive. Windows needs at least four gigabytes of space for its installation file. Flash drives are fairly cheap; you can get a 16-gigabyte flash drive—four times the space you need—for less than $10.

Plug the flash drive into your computer. The flash drive should fit into one of your computer's rectangular USB ports.

Format the flash drive to FAT32 or exFAT. When formatting your flash drive, click the File system drop-down box, then click FAT32 or exFAT in the drop-down menu. Formatting your flash drive will erase everything on it.

Download the Windows disk image. Open the Windows 8.1 download page, scroll down and select a version of Windows 8.1, click Confirm, select a language and click Confirm, and click either 32-Bit Download or 64-Bit Download in the middle of the page. This will prompt the disk image (ISO) file to download.

Make the flash drive bootable. If you're installing Windows 8.1, you'll need to use Command Prompt or another bootable USB method to ensure that your computer will recognize your USB flash drive as a software installation location.

Add the ISO to the flash drive. Copy the downloaded ISO file by selecting it and pressing Ctrl+C, then open your formatted, bootable flash drive and press Ctrl+V. The ISO file will appear on the flash drive after a few minutes, after which point you can proceed with changing your computer's boot order.

Changing Your Computer's Boot Order

Go to the computer on which you want to install Windows. If you're merely trying to install a new version of Windows on your existing computer, skip this step.

Plug in your USB flash drive. Insert the USB flash drive into a USB port on the computer.

Prompt the computer to restart. Click Start Windows Start, click Power Windows Power, and click Restart. Your computer will begin to restart. If the computer is off, press its power button to turn it on, then move to the next step. If the computer turns on when you open its lid or move the mouse, you'll still need to restart it before proceeding.

Rapidly press the computer's BIOS key. As soon as the computer's startup screen appears (the screen right after the computer shuts down and is beginning to restart), begin pressing the BIOS key. Your computer's BIOS key will vary depending on the manufacturer, but it will usually be one of the function keys (e.g., F2), Esc, or Del. You can check your computer's BIOS key online or in the manual that came with your computer. Many computers will flash a "Press [key] to enter setup" (or similar) message at the bottom of the screen as your computer is starting up. This is the key that you should press. If you miss your opportunity and the computer finishes the restart cycle, you'll need to restart it and try again.

Find the "Boot Order" section. This section is usually in the Advanced or Advanced Options tab, but each BIOS menu is different. The "Boot Order" section will have a list of different startup locations, including your hard drive's name and your CD drive.

Select your flash drive's name. Using the arrow keys, move the highlight bar down until it's covering the flash drive's name. On some computers, you'll instead select Removable Storage or Removable Drives (or something similarly titled).

Move the flash drive to the top of the list. You'll usually do this by pressing the + key until the flash drive is at the top, but check the legend at the bottom or on the side of the BIOS screen to see if your controls are different.

Save your changes and exit the BIOS. There's usually a key that you can press to do this, so check the legend to see what it is and then press it. You may have to press another key to confirm this decision.

Restart your computer again if necessary. If your computer doesn't greet you with a "Press any key" screen and instead finishes the restart cycle, restart it again to boot from the flash drive. This will launch the Windows setup process.

Installing Windows

Press any key when prompted. When you see the "Press any key" line of text, press any key on your computer's keyboard to proceed with the Windows installation.

Select a language and region. When the Windows installation window pops up, select a language, region, and any other preferences listed there. You may also be prompted to select keyboard settings here. On Windows 7, you'll check the "I agree" box here instead, then skip ahead to the "Select a partition" step.

Click Next. It's in the lower-right corner of the page.

Enter your product key. When prompted, type in the product key that came with your computer or installation disc, then click Next. On Windows 10, you must first click Install now. You can also skip the product key entry for now by clicking the Skip option. On Windows 7, you won't be asked for your product key until after the installation is complete.

Agree to the terms of use. Check the "I agree" box, then click Next.

Select a custom installation. Check the "Custom" box, then click Next

Select an installation partition. Double-click the partition on which you want to install Windows, then confirm your choice when prompted. You may also need to select the empty partition and click Next to prompt the installation process to begin. On Windows 7, you'll select the partition that you want to use, click Delete, confirm the decision when prompted, click the empty hard drive, and click Next to begin the installation process.

Wait for Windows to finish installing. Your computer may restart several times during this process, and the installation may take several minutes to over an hour depending on your computer's speed.

Follow any on-screen instructions. After Windows is installed on the computer, you'll be asked to set up a few more preferences (e.g., your language, account name, email address, etc.) before you can begin using Windows. On Windows 7, you'll be asked to enter your product key here.

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