this is a hard one, i cant really help here. but there is one option , go to whdload.de and ask them to do a patch for it , that would basically mean that you need to make a disk image of your orginal and send it to them, then they will make a patch + installer for it and it would most likely work after that.
its worth a try.
www.whdload.depatchers i can recomend to do it , Psygore and Cfou and jotd , they are the only ?? ones left who do ADos images i think...