After all I came to the same solution as you did ... the first time I messed around with the registry... and guess what Windows 98 didn't even crash...
The system then still would not install giving me some "Zugriffsverletzung" - Error.
However, this error only occured when trying to install the full package file. Downloading the splitted files enabled installing the program with no problem.
Thanks to Roman and Michael for this great program

)