Hi,
Sorry to hear about your previous experiences with freelancers, let me assure we are not all like that.
I have a few questions regarding this project.
You say you have a bin file, yet specified c# as a language which does not use bin files. Do you know the language the original program was programmed in? If redoing the whole project is actually your preferred option, you can ignore this question.
You mentioned you wanted a serious programmer. I must ask you, are you prepared to pay for a serious programmer. I will be honest, for $50 you will not get much from a serious programmer. An eager beginner maybe, but....
Assuming the above questions are met positively, in order to make an accurate bid full project specifications are required, including what the functionality of each screen is. Once this information is received I will be happy to put together a proper bid with costs and time predictions.
Regards,
Martin