BACKTRACK IN VIRTUAL BOX

Downloads Required.

Windows Virtual PC 
Backtrack  5 ISO -Gnome or KDE but NOT ARM 
After installing, Windows Virtual PC and enabling Hardware Virtualization, you are set up to run BackTrack 5.

Start > Windows Virtual PC > Windows Virtual PC
Now click Create Virtual Machine
Give a name like BackTrack 5 and click next.
Now specify the amount of RAM , remember NEVER give more than 50 % of your RAM to a VM !
Check the enable computer network connections and click next .
Now create a dynamically expanding virtual hard disk .
Now you will see a .vmcx file , right click it and go to settings.
Go to the Networking tab and in Network Adapter #1 Select Shared Networking (NAT) or else networking will NOT work!
Now go to DVD drive tab there select open an ISO image and select the location where the backtrack 5 iso is present!
Now Click OK and double click the .vmcx file and backtrack will run!