regarding booting windows 7

[santhana ruban]

hi , i had tried to change my operating system so i booted windows 7 in usb drive.
it get detected during the booting time by pressing f8 key but when i select it blank screen appears with cursor blinking and my old operating system win 8 get started
how to solve this please help

 

[Paul NZ]

How did you put the install on the flash drive? If you copied an ISO to it it's not bootable

 

[santhana ruban]

How did you put the install on the flash drive? If you copied an ISO to it it's not bootable

 

[santhana ruban]

yes i had booted my os as iso file by using windows 7 usb tool software and bootable os had been detected when my old os opened nomally in my computer option > removable disk