I don't know if you are already doing this but I had a similar problem with an install on a Win03 Box. The .dlls used were installed in the system directory which worked fine on all versions of windows except win03. Once I changed the installer to install the .dll's in the programs directory the problem went away. Good Luck!
Kendall Dixon
Data Integration Programmer
Tusculum College
Greeneville, TN 37743
423.329.5353