Thanks for that info prathapml, however, if you read the thread you would have seen
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I can confirm what your saying.. I too tried Aaron's 'Unattended Web Site' method of Installshield files and found that it rebooted without asking.
so I have been all over Aarons site looking for an answer to this one...
The problem some ppl seem to get (including me) is using the normal OemPnPdrivers path, despite the 'drivers' being installed ok, certain features don't get installed, with ATI that's the SmartGart panel that's missing, with nVida it's the SoundStorm controls that don't get installed...
Further to this, using the ISS silent install method, I have been unable to get the new version 3.9 ATI to install correctly no matter what I do, they just ain't there after reboot, despite me watching the installers running during my unattended...

(It worked fine with everything up to 3.8, it's only 3.9 that won't work)
With nVida, I find that when I do a silent install, it will still restart the computer regardless of the settings in the ISS file and so the only time I can run this install so it doesn't reboot in the middle of my unattended, is to run it
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Perhaps it's only certain configurations that suffer this, as I'm sure many people have ATI/nVidia hardware installed, but if everyone was getting this problem I'm sure there would be more posts, and more of an effort, to find a soloution for it...
Point is.. Aarons Unattended instructions no longer work for me unless I go back to using older drivers... so reading his site yet again won't help...