tailgunner, you haven't given me much to work with. What was the nature of the exception? Also, there should have been a "details" link in the exception message which would have revealed the state of the machine at the time of the crash.
In any event, this would seem to be a problem local to your machine. (The number of downloads of AIFP 1.5 is approaching 8000; to my recollection, your's is the first such report.)
AIFP checks that each file it requires exists before attempting to use it. If one is missing, it is treated as a handled exception. So, that leaves a possible corrupted file or something external - like a faulty NET.Framework 2 .
You note that you're using Version 1.5. There have been several minor releases since that general release (see the top post in this forum). I suggest you download 1.56, released only last weekend, and try again. If that doesn't work, try repairing/re-installing NET.Framework 2.
Irrespective of the result, please send me the nature/details of the exception messaqe.
Don