When I created a unattended windows install using Nlite. I selected an option that makes it so that when full screen in Windows Media Player the bar that has the Play/Pause buttons comes up just about instantly thinking I'd like it. But I don't and I already installed the copy of Windows. And I don't wunna have to reinstall Windows XP just because of this one tiny annoying thing.

So if anyone can help, I'd really appreciate it.

You could capture changes made by the Tweak MP plugin and look over the reg changes....that may open some possibilities up.