How to install virtual box in backtrack os

As if you can create a new computer (virtual machine) and install it with the OS you want (Guest OS). More great again, you can run both at the same time; moved from Guest to Host and vice versa with ease. If it is not needed anymore, you can simply remove it (remove) virtual machine without the complicated process.
let's start.
first step

1. prepare-kernel-sources

2. cd /usr/src/linux

3. cp -rf include/generated/* include/linux/

4. echo deb http://download.virtualbox.org/virtualbox/debian lucid contrib non-free >> /etc/apt/sources.list

5. wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add -

6. apt-get update

7. apt-cache search virtualbox

8. apt-get install virtualbox-4.1




















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press to create to finish

command location select where the virtual box iso file is stored by the users themselves
and size (size) gives the size of the file on a virtual box and press next

 Click on a dynamically allocated next

  








the start-up command dist
select creat new hard disk and then click Next.

 
 










user on the display memory size required to fill the memory that will be used only for general usera pc (512). then press the next button.



now its time to install the windows OS as normally. the step is. click the 'devices'menu (cd) and click menu 'choose file'  it mean you choose windows OS master with .iso file type,
click new in the virtual box,then click next and dialog box appears and
enter the name of the pc user
and press next.