Connection Failed: Unable to Get IP address

I cant connect to my AP from my laptop,im using backtrack 4 r2
So the problem is when i leave unsecured AP it want assign me IP adress,and DHCP is...

Is it possible to encode backdoored exe file with more then one encoder?
If it is can someone give me axample how.

How to change to other subdirectory trough console if directory name is for example : "backtrack linux" ?
Let said if name of directory is just "dog" then i just do "cd dog" and i am there.
Sorry...

I dont understand you well,can you explain it more?
I have normal installation of bactrack on hard drive.It worked well till now.

I updated last kernel for backtrack 4 succesfully,but after i restart my computer there is no sign of new kernel.I run uname -a and its said its 2.6.9 .I tryed to run apt-get update,apt-get upgrade...