I'm not sure what else it could be. When you registered nireports.dll did Windows give you a message saying it registered correctly? What version of Windows are you running? What else might be different between the computers that print fine and this one? You may want to try reinstalling LabVIEW. The real solution, however, would be to upgrade to the latest version of LabVIEW. Good luck!
Robert Mortensen
Software Engineer
National Instruments