USB plug karanna > then format (with default settings) > run cmd as admin > goto path name "c:\windows\system32>" then type "diskpart" > enter
user account control dialog box > yes > new cmd ekak ei (diskpart.exe)
diskpart > list disk >
select disk (number) [your usb drive number] >
clean >
create partition primary >
select partition 1 >
Active >
format fs = ntfs [or] format fs = ntfs quick
Cancel the auto play window >
diskpart > assign
exit >
exit >
insert win7 dvd or mount > close the auto play > right click > open > select all (ctrl+A) > copy > right click the flash drive > paste > done
boot devices priority > usb
note - Advanced BIOS features > enable usb devices > done