SixApart, developers of MovableType, published a fix for the Windows Server 2003 error that many people are experiencing when installing version 3.2. The original error is described here (and a fix). The fix seems hacky to me.

The original error you might be getting:

CGI Error
The specified CGI application misbehaved by not returning a complete set of HTTP headers.

I have not tried the fix. My current implementation is working, so I’m not inclined to break it unnecessarily. But if anyone tries it and has good luck with the fix, please post a comment so that others know it works well.