First of all, my english is not very well - but I will try anyway

I have downloaded BackTrack 4, and want to install on my computer.
First I put the downloaded file into Deamon tool - so I could see the files..
I have 2 folders.
boot
BT4
But i dont really know what to do with them?! I have to install it on my computer, but what file do i need to click on, to install it?
Hope somebody can help me.