Hi

You have to use Dodi VB decompiler for level 5.
I don't remember the password now but after you decompile using that decompiler you get one .bas file showing the username and password which is the wrong one.Actual password is in coded form in the other 2 or 3 files you get after decompiling.
It's like gc=001 ,gc=002.... and so on.
Try it out.
BTW level 6 and onwards are the real challenge.

Hope this post helps you.
C ya