Ensure you have vhost config file uncommented in the httpd.conf file
e.g.
# Virtual Hosts
Include conf/httpd-vhosts.conf
Then setup your virtual host as you wish, see http://http.apache.org/docs/2.2/vhosts/ for examples Example here is for running on a different port (88), on windows.
Listen 88
NameVirtualHost *:88
<VirtualHost *:88>
ServerAdmin myemail@address.com
DocumentRoot C:/htdocs/bromine
ErrorLog C:/htdocs/logs/error_88.log
CustomLog C:/htdocs/logs/access_88.log common
</VirtualHost>