I make one assumption the when you are referencing the versions of NI-DAQ 6.2 & 6.3, that you mean 6.9.2 and 6.9.3 since we skipped from 6.1 to 6.5 and those are both fairly old drivers.
With that assumption, when you update a version of NI-DAQ you want to make sure you specify that you want support for your version of LabVIEW. You can check this by clicking (Add/Remove or Change) in Windows Add/Remove Programs and view the feature tree. Here you will notice there is an option for LabVIEW 6.1 support. Make sure this item is marked to be installed on your hardrive. This will enable all you DAQ related functions in LabVIEW.
Kevin R