http://msdn.microsoft.com/en-us/lib...94102.aspx "Time to delay before starting the Windows operating system—in seconds. Beginning with Windows Vista, SystemStartupDelay is obsolete because Boot.ini is not used to configure system startup. Instead, use the BCD classes supplied by the Boot Configuration Data (BCD) WMI provider or the Bcdedit command."
So, use bcedit.exe... Unless, you needed/wanted to run this remotely, then you may need some kind of workaround.