Here is the Patch
that fixes the loading issues.
The official Vista Patch does not work as it does not recognize that the game is installed...
There was a batch file made by someone that extracts the files of the official patch, and apparently only this DLL file is needed.
So this DLL is from the official patch, simply replace the original "Tycoon.dll" in your installation folder with this.
Hope this helps, it's simplest way, and it works.