>>I see that you have not got any answers, and I am pretty sure it's because we all think the same. Put yourself in your user's place: What right do you have to change their machine? If they want the taskbar to be visible, then it's their choice, and you should not force another setting upon them. If you have a very, VERY good reason for having the taskbar removed, then you should ask your user to hide it, simple as that.
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>Actually, there is a kind of setup where this is exactly what you want: a display machine which needs to run unattended. I tried that once (under FP2.0, IIRC) and it isn't as trivial as you'd think. Completely different paradigm. And the last thing you want is for the underlying scaffolding (i.e. the OS) to show up.

Yes, I know, and it's usually called Kiosk mode.