First the important warning: The procedure below have not been tested on Windows Vista nor Windows 7 by me. So don't come back asking for support on those scenarios. Working solutions and fixes to whatever problem are welcome, of course 
We will learn how to install BackTrack 4 Pre Final inside a Windows XP Installation without partitioning or disturbing it in any way, and take advantage of its native boot loader to boot BT. This is usefull if you don't have a 4Gb thumbdrive, dvd drive, or your computer just can't boot from USB media whatever reason.
I know, you find this very odd. I mean, is there anyone with a thumbdrive smaller than 4Gb, or without a good friend with one to borrow? Well I have many friends to borrow one, but I just wanted to find an alternative way of installing BackTrack. This is -plus the fact that I actually lack of a >4Gb thumdrive- how I got to this article searching the remote-exploit forums. All credits for the below procedure belong to the guys on that post.
Now get into our bussiness.
