Hey hanpedro,
Your vhost file is incorrect. I just wrote a tutorial on doing what you're trying to do the other day. Check out this link and see if this helps explain it:
http://www.myownserver.info/index.php/step-4-additonal-settings/20-fakedomains.html
Your VirtualHosts should look something like this:
<VirtualHost *:8080>
ServerName test1.com
DocumentRoot K:/web/test_dev
ServerAlias www.test1.com
<Directory "k:/web/test_dev">
Options -Indexes FollowSymLinks
AllowOverride None
Order allow,deny
Allow from all
</Directory>
</VirtualHost>
<VirtualHost *:8080>
ServerName test.localhost
ServerAlias www.test.localhost
ServerPath k:/web/test
DocumentRoot k:/web/test
<Directory "k:/_web/test">
Options -Indexes FollowSymLinks
AllowOverride None
Order allow,deny
Allow from all
</Directory>
</VirtualHost>
I'm not 100% sure the www. will work, so you may be able to leave the "Server Alias" line off.
Take a look at my website and you'll find this and much more information regarding configuring XAMPP, installing addons and more. It's all free work I've donated my time in putting together to make it easier for people wanting to know more and spend less time learning it.