Try with the custom install of LabVIEW. Uninstall both Ni-IMAQ and LabVIEW from Add/Remove Programs. Then put the LabVIEW CD in and select Custom installation. Then choose to install only LabVIEW, with no drivers.
After you have LabIVEW installed, then install the NI-IMAQ from the CD that came with the PCI board.
Zvezdana S.