orca? do you mean Windows Installer 1.0 SDK (x86)?
The orca thing you need is included in this package: http://www.microsoft.com/downloads/details.aspx?FamilyID=105dfc41-801e-4441-aa75-7696d794f109&a ...
Create a Temp folder on harddrive. Name this folder ‘HL2_DVD’ (without the ‘’) This will be the Label of our DVD.
Copy all contents of CD1 to this Temp folder.
From CD2 ...
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