need help with idea

I have an arcade site and this is what I'm looking to have done if possible.

When someone visits the page they will see it behind a film and in the middle will say something like "download to play unlimited games."

And the person would only be able to access the site without the film on the front if they have installed the .exe file.

Thanx

Please let me know

I can make it so that it only gives access after they download the file or a couple of minutes after they do. If you want to confirm that the app. was installed you will have to modify it in a way that it goes to a specific link after it's installed. Otherwise you can't confirm the installation but you can make them think you can by unlocking it a few mins. after they click the dl link.
let me know of your thoughts and your budget.