I have been using the RunOnceEx method to install the applications, but since when I slipstreamed SP2, the installation of the application would execute twice, ex: I have 15 applications being installed and while installing, lets say, the 7th application (it occurs randomly), a new window pops up and restarts installing the same stuff. This is my winnt.sif ;SetupMgrTag [Data] ; AutoPartition=1 MsDosInitiated="0" UnattendedInstall="Yes" AutomaticUpdates="Yes" AutoPartition=0 [Unattended] UnattendMode=FullUnattended OemSkipEula=Yes OemPreinstall=Yes UnattendSwitch="yes" TargetPath=\WINDOWS OemPnPDriversPath="Drivers\000_nforce;Drivers\000_nforce\AudioDrv;Drivers\000_nforce\Ethernet;Drivers\000_nforce\GART; Drivers\000_nforce\IDE;Drivers\000_nforce\MemCtl;Drivers\000_nforce\SMBus;Drivers\001_SATA;Drivers\002_nvgfx;Drivers\003_3COM;" DriverSigningPolicy=Ignore FileSystem=* [GuiUnattended] AdminPassword= EncryptedAdminPassword=Yes OEMSkipRegional=1 TimeZone=110 OemSkipWelcome=1 ..... the RunOnceEx items are registered with an INF file using the cmdlines.txt file. I will post a pic asap cos i m testing on VMWare INSTALL.INF