how do u unpack if u dont find how a exe is packed?
 

I am asking for how do u do when do u dont know how a exe is packed, i try using nice unpacking and identifying sofware but maybe i dont use the best, then what can u do then?

You load the packed program into your favourite debugger and watch it unpack the program. As soon as it enters OEP, you dump, fix, and see if it works :)

If it doesn't, you debug again and find out why. If it does, you've cracked it.

Once you have done a few, you get to learn bits of the code and you can easily see the code patterns and go "Ahh! This looks like just a modified Armadillo clone!" (for example) and unpack as appropriate.