I am writing in the hope of saving others some grief.
Prime95 (http://mersenne.org/) soaks up all available background CPU cycles while trying to help find large mersenne primes.
Apparently when it is running, it prevents some or all of the postinstall activity from completing. (On windows 2000 anyway)
It is a simple matter to temporarily disable prime95 while install/updates are taking place, provided one knows that this is important.
Many many thanks for the resizeable setup window.
neal
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