hello.i have same problem whith same laptop and backtrack4
DO NOT use the old 4
install 5 release 2 !!!!!!!!
also if you can NOT figure this out all on your own you should NOT BE USING Backtrack
if you do want to learn it then
install 5 r2 and NOT the old 4
PAY for the training courses from "Offensive Security"
and fallow the how toos
also if you can not change the old how to's to use the current bt then try this
earn a 6 year degree in CS with a minor is computer forensics
then in 6 years install BT