This is how I did it. Slipstreaming method gave me some weird errors In RunOnceEx.cmd REG ADD %KEY%\000 /VE /D "Office 2003 Professional and SP1" /f REM Working REG ADD %KEY%\000 /V 1 /D "%SystemDrive%\Install\Applications\Office2003\setup.exe TRANSFORMS=Unattended.MST /qb-" /f REG ADD %KEY%\000 /V 2 /D "%SystemDrive%\Install\Updates\Office2003\Office2003SP1-kb842532-fullfile-enu.exe /Q" /f