The Dr.X versions I have seen, seem to have an expiry date. They lock if the date is past a certain point. The easy workaround used to be changing the date on the bios clock before running the .EXE. You could even do it with a batch (.BAT) script file.
When was the last time you run yours? It is wise to make a backup before running the app. If your version is not timebombed, I'd appreciate a copy (if nobody minds

).
Thx,
George