How to get Apache web server to run on other computers

WAMP includes Apache, so installing both has apparently caused some confusion and you got both. The sub-folder problem can be a matter of folder permissions.

Optionally, you could try and return to a clean system. This is not required, since Apache is working. But if you wish to try, first uninstall everything, maybe using Revo Uninstaller Freeware, and even maybe do system restore to a time when both were not installed.

Just beware that monkeying with system restore can get one into deep troubles if you or Windows have since installed anything else but WAMP and Apache. I myself try to avoid it if at all possible, even at the cost of a slightly mis-installed product.

You need to use WAMP, since you want to do PHP development, so ensure it is installed and working.

You can use NetBeans to directly work on your local computer files in the www folder of Apache, then test using the browser on localhost. I suggest using Firefox with Firebug for debug. The only complication here are folder permissions.

You can use NetBeans to deploy your application directly to the remote server.
See this article : Deploying a PHP Application on a Remote Web Server Using the NetBeans IDE.

I think with your first question, you're asking how to contact your laptop's Apache web server from the Android device.

Since you set up the virtual hotspot on your Windows 7 machine, that is an additional interface that your laptop is using, which means that interface has an IP address of its own. On your laptop, go to command line and do ipconfig, and look through the results for something like Virtual Wifi Adapter and see what IP it's showing. That's the IP that the Android device will use to reach your laptop, since they're on the same network.

Regarding the second question, you'll have to consult XAMPP documentation and your configs to make sure the Apache server is listening for connections outside of localhost and to see which port it is listening on.