I'd wait for OneShot to see this, but he's not around on weekends and I'd rather not keep you waiting. My best guess is that this is a compatibility issue with DW 1.03, which is the version that I'm guessing is what you got from SF. Patch to 1.04 first, then try the installer again. Also, I think the installer expects to find DW in the standard directory (program files/SCS/DW) and might have issues if it doesn't find it there.
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