Secure way to deploy a Laravel 5 Application on Windows Machine with Internet Connection

Currently i have developed a finance system for a client and he wants to me deploy it on his 'server'. The "Server" is a computer with windows 7 installed and the system is supposed to be accessed on a LAN.

For now, i have deployed the system on Xampp. I know that the xampp, wampp, etc.. packages aren't very secure, So i created a password for PhpMyAdmin, Xampp page and MySql.

I have read many resources stating xampp can be more secured by installing it on a computer with no direct internet access and only allowing access from the local computer (no network access), but as you can understand, the system has be to accessed on the LAN and there will be internet access to the server.

I've also read about deploying it on a Linux VM.

So considering the above situation, here are my questions.

1. What is the most secure way to deploy a laravel or any php application that will be accessed over a LAN on a windows machine with internet connection?

via Chebli Mohamed