How to setup Windows 7or Windows 8 from USB drive?

Bootable USB Drive:

1.Start PowerISO (v4.8 or newer version, download here).

2.Insert the USB drive you intend to boot from.

3.Choose the menu "Tools > Create Bootable USB Drive". The "Create Bootable USB Drive" dialog will popup. If you are using Windows Vista or Windows 7 / 8 operating system, you need confirm the UAC dialog to continue.

4.In "Create Bootable USB Drive" dialog, click "..." button to open the iso file of Windows 7 or Windows 8.

5.Select the correct USB drive from the "Destination USB Drive" list if multiple USB drives are connected to the computer.

6.Choose the proper writing method. "USB-HDD" is recommended.

7.Click "Start" button to start creating windows 7 / 8 bootable USB drive.

If no errors occurred in the above process, you should now be all set to setup Windows 7 / 8 from USB drive!
[url=http://www.poweriso.com/tutorials/how-to-make-win7-bootable-usb-drive.htm]

Thanks

Another way that I know.
how to install windows from USB drive.It become necessary to know when you have notebook or your DVD-ROM has been damaged.moreover it is faster to install windows from USB drive than CD or DVD.I will tell you some simple steps and after that you are ready to  use windows 7.
to read whole tutorial with picturisation.click below
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nice information........