The method above doesn't seem to prevent a reboot in 1.6.4.
Anyway, we We found that you need to use [http://www.technipages.com/download-orca-msi-editor.html orca] to create a transform for the msi in which you delete the entry <code>ScheduleReboot</code> under <code>InstallExecuteSequence</code> in the msi.
== Windows 2000 Install ==