Run command line with admin rights,

DISKPART

LIST DISK

SELECT DISK 1

CLEAN

CREATE PARTITION PRIMARY

SELECT PARTITION 1

ACTIVE

FORMAT FS=NTFS Quick

ASSIGN

EXIT

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

CD BOOT

BOOTSECT.EXE /NT60 H: – make USB bootable

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