Dear sirs, I think there's something not entirelly clear to me and perhaps to some other people, because I couldn't find any solution to my problem.
I have downloaded an i386 ISO for Squeeze (6.0.1a) and used the same media to perform installation on 2 different machines. On the first one I got a perfect i686 and on the other an AMD64 kernel. presumibly, my media is not mult-arch. One problem I have felt so far is about Virtualbox OSE, which brings a kernel problem while installing from Debian Packages. Best Regards, André.