Installing FM Pro 12v4 on Windows 7 Home Professional today, we got the following frustrating error early in the process: "The program can't start because XalanDOM.dll is missing from your computer. Try reinstalling the program to fix this problem." A tough situation, given that it was the installer itself that wasn't working.
Thankfully, Susan at FMI tech support quickly suggested an easy fix that got us on our way.
The answer: Move the installer from the downloads folder to the root of the 'C' drive before running the installer.