in that case try this:

dont run the script before installing to your target...

install first... after install, restart and come back into the installer and run the script...

see if u can get the installer to finish that way... if the installer doesnt run properly before running my script, it has to be something not related to my script... cos this way, the script hasnt done anything...

anyways, try that and lemme knoe... oh and click "window" > "installer log" and take a snap of that too so we can see what exactly went wrong...