install windows on USB and carry in pocket

I am going to explain how to install Windows on a pen drive/usb..
this a very useful hack..u can carry and work in your customized window wherever u go..

Requirements to install Windows on USB:

# An USB flash drive with a minimum of 6 GB disk space to install Windows 7 or Vista. You can use a 4 GB drive to install XP.

# Bootable Windows 7 USB or DVD.

# Free time

So let’s begin with the installing Windows 7 on USB procedure:

1. First of all, connect your USB to the machine and backup all the data from the USB drive.

2. Download VirtualBox portable, double-click on the executable file and extract the contents to your USB.

3. Now, go to the VirtualBox portable folder in USB, and execute the Portable-VirtualBox (.exe) file.

4. From here onwards, you need to follow the onscreen procedure to create a virtual disk and install Windows 7 on USB. Follow the install Windows 7 on VirtualBox guide to complete the process.

5. Once you finish the installation process, you can safely close VirtualBox and remove your USB drive.

6. You can now use this Windows 7 USB drive on any Windows machine that you want. To use Windows 7 on other machine, connect the Windows 7 USB, open USB drive, and run portable-VirtualBox file.