Probable cause #1
Have you run an earlier version of T4Win prior to this? If so, the preferences file format has changed. Look for the following file named "_t4winprefs.xml" (note the leading underscore) in the current user's application data folder.
Example:
"C:\Documents and Settings\userid\Application Data\_t4winpefs.xml"
Probable cause #2
Do you have MSXML 3 or MSXML 4 installed on your system?
If not, the download links are in the FAQ document.
Regards,
Rick