I am a self employed independent software development consultant at 
Installing Azure Tools for Visual Studio 2010 Fails On IIS CGI Dependency
I was trying to install the Azure Tools for Visual Studio 2010 via the Web Platform Installer, but it kept on failing on me. I complained on Twitter and @wadewegner helped out.
Error message I got from the installer (TwitPic)
So to make the error message I received a bit more google-able I’m writing this blog post with the error I received and how I got it to work.
Problem was with the CGI feature of IIS. It failed on installation. I got an obscure error line and code in my Web Platform Installer Log:
Error: 0 : Unattended setup returned ‘-2146498529′
Googling that and “-2146498529 IIS CGI” didn’t help me. I tried installing just the IIS: CGI dependency via WPI, but that didn’t help. In the end the solution for me was to install CGI for IIS using “Programs and Features” and Windows Components. Then start WPI with the Azure Tools. That got it all working.
Edited April 19th: Link to image of observed error
If you like my writing you should subscribe to my RSS feed.