Windows OS with a PEN DRIVE

01). Download this software 'Power ISO'

02). Insert Windows 7 DVD into DVD drive. THen open 'Power ISO -> Copy -> Make CD/DVD Image File' and create Windows 7 ISO image file.

03). Tools -> Create Bootable USB Drive

04). Then a window (Create Bootable USB Drive) will popup;

Source image file: browse and select your Image File

Destination USB Drive: you pen drive (your pen drive should be at least 4GB)

Sttings: write method: USB-HDD

Start

DONE! after copying appropiate files into USB, restart the computer. Then you can install WINDOWS 7 OS by this bootable pen.