
Many times, when it comes to repairing or formatting a computer, we come across an important problem: that it does not have a CD or DVD drive through which we can perform these actions. However, this problem has a much easier solution than you might think, a method that only requires a Bootable USB, compatible with built-in USB inputs on all types of equipment.
Don’t you know what a bootable USB is? Do you know what it is but you don’t know how to make your USB drive bootable? Do you need to format a computer that doesn’t have a CD or DVD reader? Don’t worry, at OneHOWTO we answer all these questions and, in addition, we teach you how to install Windows 7 from USB – step by step. Let’s go there!
What is a bootable USB
A bootable USB drive has the function of housing an operating system or software that, in addition, can be booted from the start of the computer, allowing make adjustments to the computer’s base system or format it completely. Bootable USBs have the same functions as a CD or DVD, but also offer the possibility of storing other files in its memory, since it shares the peculiarities of a classic USB and a bootable drive.
These bootable USB drives are ideal for newer computers, as these usually do not have a CD or DVD drive built in and, without bootable USB drives, these computers would have serious problems to repair and boot their system in certain cases, as well as to format them completely. For their part, these units are so versatile that they also enable data recovery, management of entire systems and many other functions without the need to affect the files on the computer; the best of all? you can change its functions as many times as necessary without any risk.
In a bootable USB drive you can install a complete operating system and use it from a computer with a different system and, in addition, you can also install any type of software, from editing programs to video games. For create your own bootable USB with Windows 7 follow the steps below:
- The first thing to do is make your USB bootable or bootable. To do this, connect your USB drive to your computer and check that has 4 or more GB of storage.
- Next, go to the Windows “Start” menu and select the “All Programs” option. Go to “Accessories” and right click on “Command Prompt”. You must run this last option as an administrator.
- When the MS-DOS pop-up window opens (you will recognize it by its black background), you will see new commands that will tell the system that the USB drive should be made Bootable. To achieve this, type “diskpart” and hit “Enter”.
- After this step, you must wait for the word “diskpart” to appear again and type “list disk” before pressing Enter. When you have done this, the storage disk units that your computer has will appear, even removable ones such as USB.
- Do not get lost, because to carry out the next step, you will have to write “select disk” plus the number or letter to which the USB drive belongs. Once again, hit Enter.
- Then type “clean” and hit Enter; this last action is the one that will finally format the USB drive. You must be very careful not to select the wrong unit.
- When this action has been processed, type “create partition primary” and hit Enter. Keep typing “select partition 1” and hit Enter again. When you’ve done this, type “active” and, as always, hit Enter.
- We’re done, so pay close attention to the last two steps: type “format fs = ntfs” and hit Enter. Wait for the process to finish and when it’s ready, type “assign” and hit Enter again.
- To complete the process, you will only have to type “exit”. Now you can enjoy your bootable USB.

How to download Windows 7
To download the Windows 7 operating system on your computer as an ISO image, you just have to follow the steps that we will present below. However, before starting the download, you should make sure you meet these requirements:
- The first thing you must have to download Windows 7 through its official website is the product key, because without it you will not be able to download the software.
- You must have a stable internet connection.
- Have enough space on the computer’s hard drive or on the USB drive where it will be stored (minimum 4 GB).
- In addition, you should consult the minimum requirements that the computer where Windows 7 will be installed must have.
Having the aforementioned result, we are going to proceed with the step by step how to download Windows 7 next:
- Enter the product key in the box where it is required, keep in mind that it consists of 25 characters. The key to download Windows 7 is in the box of the purchased product, either in physical version or online through an email that you will have received after purchase.
- After verifying the validation key of the operating system, you must select the language you want from the pop-up menu.
- Next, and this is one of the most important steps, you must select the version of Windows that best suits your computer, either the 32 or 64 bits. Keep in mind that you will receive both versions through the links.
- After selecting the correct version from the link, the download will start automatically.
If you want to discover a more detailed step-by-step with photos on how to format and install Windows 7, don’t miss this other oneHOWTO article.

How to install Windows 7 from USB: step by step
As we have seen, downloading Windows 7 is an easy task, so now you just have to take it to your bootable USB drive and install it on the computers you want. Find out how to install Windows 7 from pen drive with the step by step that we present below:
- The first thing you should do, and already having a bootable USB, is to copy the Windows 7 software to the unit. Remember that if you have an ISO image you must unzip it before copying it to USB.
- Next, you must turn off your computer in order to insert the bootable USB drive with the copied operating system. To access the system boot panel, you must turn on the computer and press any of the F12, F9, F11, F8, F10 or ESC keys + any of the aforementioned keys or TAB.
- Once you are inside the boot system menu, look for the option “Boot Menu” and press Enter.
- As soon as you can enter the Boot Menu, look for the “USB” option and hit Enter again. In some cases, this option may be presented to you under the name “Removable Devices”.
- Next, go to the “exit” option and wait for the computer to restart to boot with the bootable USB drive.
- Once the Windows 7 operating system installer starts, you will only have to follow the instructions that the installation wizard will indicate.
After this last step, you will already know how to install Windows 7 from USB and you will be able to enjoy this modern version as much as you want.
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