I checked into your problem. Your LabVIEW and DAQ versions are not compatible. There are some extra steps you will have to follow to be able to use NI-DAQ 6.9.3 with LabVIEW 7.x or 8.x. Please follow the steps in this KB:Using Older Versions of NI-DAQ (6.9.3) with LabVIEW 7.x and 8.x to solve your issue. This should solve the problem you are having with the missing DAQ VI's in your LabVIEW functions pallette.
I am glad to hear that you are able to upgrade to NI-DAQ 7.4.4. That is easier that trying to stay with 6.9.3. 7.4.4 is the latest version of the legacy DAQ driver and you should experience less problems with it. I wish you the best in your application!