You must be sure also that the installation directory of DAQ driver is the same of the path into which you installed CVI. I had some problems with CVI 6.0 and NI-DAQ 6.8: CVI installed itself in c:\program\national instruments\measurement studio\cvi\ , while driver set by default c:\program\national instruments\cvi (the old path, valid for cvi 5.5). When I changed this path the first time, installation application changed it automatically, I didn't check and I had the same problem as you. The trick is to check the path: when you set it and click on NEXT, you have to click on BACK and control the path has remain the same, then finish the installation.
Bye.