>I'm running NT4.0 with VFP6 sp3. I can duplicate this same install behavior on another machine running Win98
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>This executable is a VFP exe with a main.prg which calls a single form that is modal and has showwindow as top level form. I've played with both properties to see if there would be a difference and to the best of my knowledge it didn't matter. I also have SCREEN=OFF in a config.fpw file compiled into the executable.
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>Any thoughts on what I may be missing here? This is really frustrating. I've spend way too much time on this and now know that I should have invested the money on a real install program

In addition to other ideas: Have you tried substituting in an extremely simple (like empty, except a tiny prg that does nothing much) EXE for the post setup, see if that works okay on re-runs? IOW, are you sure it's the form that's causing the problem, and not the setup process? Next, if that yields nothing:

I've bumped into problems with the post-setup trying to do anything very complex - now I just stick the code in the main application, and check to see if it needs to be run or not. That's a good quick fix.

Or use the other option, of course, a fancier installer.