I think that I understand the problem. The fix (work around) is to install the program in the default location.
If I install in "C:\Program Files\TRiLOGI" TLServer DOES NOT run.
If I install in "C:\TRiLOGI", then the TLServer DOES RUN.
I specified "C:\Program Files\XXX" because this is where most Vista executable programs are installed and because YOUR installer opened a "Select Destination Directory" window asked me to select a folder.
As a minor point, when the TLServer does execute, the window that opens "PLC WebServer" partially hides the "Help" button and the "Version 3.15" text in the lower right corner. The "Serial Port Setup", "Configure Users", and "Setup Emails" buttons are not centered horizontally. The window cannot be resized. If you pull on the bottom corner (diagonally) it will show the complete "Version 3.15" text momentarity, but the window snaps back to it's initial size.
Gary D.