How to create a bootable USB flash drive to install Windows 8.1

Requirements:

*USB Flash Drive (8GB will be perfect)
* Windows 8 or 8.1 DVD or ISO.


1. Save your data from pendrive...

2. Start a command prompt as an administrator:

Click Start.
In the Start Search box, type cmd, and then press CTRL+SHIFT+ENTER.
If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.

OR

Click Start, click All Programs, and then click Accessories.
Right-click Command prompt, and then click Run as administrator.
If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.

3. Write DISKPART, then Enter
(Click on pictures below.)

Then write LIST DISK and note USB flas drive's number (Disk number - eg. Disk 1) .

4. Now write the next commands (and hit Enter after every command)


SELECT DISK 1

CLEAN

CREATE PARTITION PRIMARY

SELECT PARTITION 1

ACTIVE

FORMAT FS=NTFS (Formatting time of USB flash drive depends on its size.)

ASSIGN

EXIT

Don't close Command Prompt, we'll need it a bit later.

5. Place DVD to DVD-ROM or mount Windows 8.1 ISO.
Check drive letter for DVD or mounted ISO (my flash drive is for G:\, and mounted ISO is for H:\)

6. Back to Command Prompt and write these commands:
(First change drive to DVD or ISO:)

H: (DVD drive or ISO)

CD BOOT

BOOTSECT.EXE /NT60 G: (USB flash drive letter)



7. Copy all Windows 8.1 DVD, ISO files and folders onto USB flash drive.



8. When copy finished we can use the bootable Windows 8.1 USB flash drive for install the new Windows 8.1 system.

Don't forget to set the right boot device to USB-HDD in BIOS.



Or choose it from boot menu: