I tried what both of you said. I downloaded the DSL 2.0, extracted it to an empty folder on my desktop, then dragged the contents into a fresh install of RA2. Then I did the same with the 2.1, and I still have the same problem. I'm on Windows 7 64-bit if that makes any difference.
You got my vote for RA2 Wizard. Always and forever.
Download from my sig. Free, full version that works.