help with cgi

hello
i am trying to run a cgi script with a .exe extension from the cgi-bin in the apache folder
the script runs but there must be something wrong because if i look at my access log i do not get a 200 ok i get a 500 604
if i try to access the script by puting its path in the browser i get
internal server error mesage
i am running a script which talks to paypal which is part of ebay and there severs expext a 200 ok response which obviouly i am not sending.
i cant figure this out
help!!!!!!!!!!!!!!!!
thanks