You must install the HIGHMat CD update like an application HighMat Download Place the file in $OEM$\$1\Install and adapt your batchfile which installs application in you unattended setup with the following line start /wait %systemdrive%\install\Applications\highmat\hmtcd.exe /quiet /norestart (i've renamed the original file to hmtcd.exe so modify it for you installation) Does the %CDROM% work !! that's all