How are things back in central Indiana. I used to deliver water softners and salt in Daleville, Chestrfield, Anderson, and a little burg called Muncie.
The post setup exe can be a specified as a file oustide your \distrib directory. The setup wizard will compile the post setup exe into the setup files. Upon installation the setup exe will be copied to the application directory on the target machine and the current directory will be the application directory. Could you be looking for a directory that doesn't exist?
The fact the exe runs on intial install and not subsequent re-install is a puzzling. Are you doing anything with the Registry?
Ken Wardwell