There is a package called Install Creator 2 that is real easy to use.
I've bought the first version years ago for the two games I released for Windows (My Brother's Keeper and Mindful Concentration).
It's a link to a competitors website, but the install package I think is really good. They even allow you to use the installer for free with a link that points back to their site after the installation is finished.
Anyway, here is the link:
http://www.clickteam.com/install-creator-2
Prove Your Worthiness
KG2Entertainment.com