Can't get to subsites. Wildcard-subdomains probably misconfigured in Apache - wordpress

Question

I'm building a portal for the organization I'm working at.
The portal is a Wordpress site using Wampserver 2.5, intalled on a Win server 2008 R2.
It's working fine and accesible from other machines over the intranet, thanks to the helpful and patient RiggsFolly.
But now, I have changed it into a network of sites so that I can build sub-portals for the different departments in my organization.
During that change Wordpress gave this warning message: Warning! Wildcard DNS may not be configured correctly!
Wordpress has a page explaining how to configure wildcard subdomains on Apache - http://codex.wordpress.org/Configuring_Wildcard_Subdomains.
I tried following it but the explanation lacks details and I'm probably doing something wrong.
On the machine where the servers and site are installed, when I write http://hipo (hipo is the current site name) in the browser's address bar, I get to the site fine.
But when I write http://depa.hipo (depa is a subsite I created successfully), the address changes into http://www.depa.hipo/ and the browser says it didn't find a server at that address.
I have probably set the ServerAlias line wrong in httpd-vhosts.conf, and also I didn't add the line *.example.com A 192.0.43.10, or in my case *.hipo A <rightIP>, cause I wasn't sure where to add it in the file.
This is my httpd-vhosts.conf file. Your help is appreciated!
<VirtualHost *:80>
DocumentRoot "c:/wamp/www/hipo"
ServerName hipo
<Directory "c:/wamp/www/hipo">
AllowOverride All
Require all granted
</Directory>
</VirtualHost>
<VirtualHost *:80>
DocumentRoot "c:/wamp/www/hipo"
ServerName subsites.hipo
ServerAlias *.hipo
<Directory "c:/wamp/www/hipo">
AllowOverride All
Require all granted
</Directory>
</VirtualHost>
<VirtualHost *:80>
DocumentRoot "c:/wamp/www"
ServerName localhost
ServerAlias localhost
<Directory "c:/wamp/www">
AllowOverride All
Require all granted
</Directory>
</VirtualHost>

Answer 1

This definition does not have a ServerAlias so try adding one like this:
<VirtualHost *:80>
DocumentRoot "c:/wamp/www/hipo"
ServerName hipo
ServerAlias www.hipo
<Directory "c:/wamp/www/hipo">
AllowOverride All
Require all granted
</Directory>
</VirtualHost>