@koldb and anyone else finding this page: I posted a more specific solution for gamers at the end of a thread already referenced here. Here's the specific post: Disabling Alt-Tab - Solution for Gamers
Also, the following instructions are really easy to follow, but instead of using "!Tab::return" as the AutoHotKey code you can replace that with mine if you're having a similar problem to what I described: Easy to Follow Instructions for setting up AutoHotKey