I am running on a Windows XP box and having trouble getting AdaDoc to work.

I downloaded the install_adadoc.exe and ran the adadoc.exe shortcut that was put on the desktop. I then created a module_ads.ads file. Next, I highlighted the ads file and right clicked on the open with: adadoc file choice. And nothing happened.

Can anyone tell me where I went wrong?

It should have made an HTML file in the same directory where your ada spec is contained. There is no popup dialogs or anything visual when you run it this way.