I can confirm that this works for PowerDVD 5.1
The solution above does not work for network installation, because you also need to offer the path to the logfile which will be created by the setup. the parameter for the logfile is called "/f2" so you could use "start /wait c:\DVD\Setup.exe /s /sms /f1c:\DVD\SETUP.ISS /f2:C:\PowerDVD4.log" for installing from a network source.
This also works successfully for Power DVD 5.7
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