John,
you are right. NI-DAQ 6.9.3 is the last version of NI-DAQ that supports legacy boards including the PC-TIO-10. Under the following link you will find instructions about how to use NI-DAQ 6.9.3 with LabVIEW 7.0
http://digital.ni.com/public.nsf/websearch/F185E098C7EC5A3486256D2E00691BB2?OpenDocument
Best regards,
Jochen Klier
Applications Engineering Group Leader
National Instruments Germany GMbH