Hi,
You must think I have already tried several times before posting here. But, anyway, I've tried one more time, installing the package with the sample data (first choice in the list).
The result is still the same, a standard Joomla Install, without the content, and most weird, without the template.
I'm on a local wampserver, I unpacked the quickstart.zip in a separate folder, created a new database, and so on... I d'ont undestand what's wrong.
Oh, and I've checked, the template is effectively in the templates folder, but did not appear in the admin list.
One more precision, this is the joomla 3.0 package.
This outside the topic, but I found really weird that I have to buy a membership for a guide on how to use a product I already paid (and for now, that is not working). In my opinion, you should rethink it.