install Windows 7 and Windows 8 from USB flash drive.

100% working guide to install Windows 7 and Windows 8 from USB flash drive.

1.    Open Command Prompt with admin rights. Use below method to open Command Prompt with admin rights.

Go to Start menu > All programs > Accessories, right click on Command Prompt and select Run as administrator.

2.    Type in the following commands in the command prompt:

First type DISKPART and hit enter

Next type LIST DISK command and note down the Disk number (ex: Disk 1) of your USB flash drive. 

3.    Next type all the below commands one by one. Here I assume that your disk drive no is “Disk 1”.If you have Disk 2 as your USB flash drive then use Disk 2.Refer the above step to confirm it.

So below are the commands you need to type and execute one by one:

SELECT DISK 1

CLEAN

CREATE PARTITION PRIMARY

SELECT PARTITION 1

ACTIVE

FORMAT FS=NTFS

(Format process may take few seconds)

ASSIGN

EXIT

Don’t close the command prompt as we need to execute one more command at the next step. Just minimize it.

4.    Next insert your Windows7/Windows 8 DVD into the optical drive and check the drive letter of the DVD drive. In this guide I will assume that your DVD drive letter is “D” and USB drive letter is “H” (open my computer to know about it).

5.    Maximize the minimized Command Prompt in the 4th step.Type  the following command now:

D: CD BOOT and hit enter.Where “D” is your DVD drive letter.

CD BOOT and hit enter

6.    Type another command given below to update the USB drive with BOOTMGR compatible code.

BOOTSECT.EXE /NT60 H:

Where “H” is your USB drive letter. Once you enter the above command

7.    Copy your Windows 7 or Windows 8 DVD contents to the USB flash drive.

8.    Your USB drive is ready to boot and install Windows 7 or Windows 8. Only thing you need to change the boot priority at the BIOS to USB from the HDD or CD ROM drive. I won’t explain it as it’s just the matter the changing the boot priority or enabling the USB boot option in the BIOS.

Note: If you are not able to boot after following this guide means you haven’t set the BIOS priority to USB. If you got any problem in following this guide feel free to ask questions by leaving comment.

This guide works 100% for Windows 8 as well. Make sure you follow all steps correctly and launch the Command Prompt with admin rights (as given in the guide) to avoid errors.