kreichrt,
I would suggest re-regestering the NI-Reports DLL by:
Start » Run, then type regsvr32 "C:\Program Files\National Instruments\shared\NI-Reports\NiReports.dll". If this does not help, please provide more information on you version of LabVIEW, operating system, and if the shipping examples that come with LabVIEW work correctly.
Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask