Hello.
I did a fresh install of Debian 7.0.0 (Wheezy), using the debian-7.0.0-amd64-i386-netinst.iso.
In the past , during the install process, it would ask if the user wanted to include the contrib and non-free repositiories. Not this time. The install went okay, but only included packages from the main repository.
If I manually added "contrib" and non-free" to /etc/apt/sources.list, and did apt-get update, then apt-get upgrade, would that add the missing contrib and non-free stuff? And would that mess up the already installed system?