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If you're merely trying to install a new version of Windows on your existing computer, skip this step. Insert the USB flash drive into a USB port on the computer. Click Start {"smallUrl":"https:\/\/www.wikihow.com\/images\/0\/07\/Windowsstart.png","bigUrl":"\/images\/thumb\/0\/07\/Windowsstart.png\/30px-Windowsstart.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class="mw-parser-output"><p>I edited this screenshot of a Windows icon.
<\/p><p>License: <a rel="nofollow" class="external text" href="http:\/\/en.wikipedia.org\/wiki\/Public_domain">Public Domain<\/a><br>
<\/p><\/div>"}, click Power {"smallUrl":"https:\/\/www.wikihow.com\/images\/5\/5d\/Windowspower.png","bigUrl":"\/images\/thumb\/5\/5d\/Windowspower.png\/30px-Windowspower.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class="mw-parser-output"><p>I edited this screenshot of a Windows icon.
<\/p><p>License: <a rel="nofollow" class="external text" href="http:\/\/en.wikipedia.org\/wiki\/Public_domain">Public Domain<\/a><br>
<\/p><\/div>"}, 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. 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. 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. 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). 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. 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. 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.

Summary:
Go to the computer on which you want to install Windows. Plug in your USB flash drive. Prompt the computer to restart. Rapidly press the computer's BIOS key. Find the "Boot Order" section. Select your flash drive's name. Move the flash drive to the top of the list. Save your changes and exit the BIOS. Restart your computer again if necessary.