Do you have any other Dark Whisper apps. installed and running on that machine? I think he uses Visual Basic and I'd suspect the VB runtime library (no, not THAT sort of Runtime) is out of date or otherwise wrong. It may be that you have a more (or less) up-to-date version on the 98 machine. Not sure if the libraries would be available from the Microsoft site - might be worth looking if no one suggests anything else.