How to remove port number from http://localhost:8123 to use as http://localhost?

I had to change my default apache port number 80 to 8123 (just random number)

I changed the following files ..

httpd.conf

Listen 8123
ServerName localhost:8123

httpd-vhosts.conf

NameVirtualHost *:8123
<VirtualHost *:8123>
  ServerName localhost
  DocumentRoot "C:/xampp/htdocs"
  DirectoryIndex index.php
</VirtualHost>

Windows Hosts file

127.0.0.1:8123     localhost
::1:8123           localhost

I am using Windows 7.

After making all these changes, I restarted apache but I am still unable to access http://localhost .... however http://localhost:8123 works fine ... can someone help me find what I am doing wrong here? thanks