You've installed very old driver versions...
You have LV 6 installed, if you program in LV6 with IMAQ1394 functions, it's only possible to update to 1.5.3
http://digital.ni.com/softlib.nsf/websearch/1D1A6E1F412635A586256F0000549306?opendocument&node=132070_US
otherwise update to 2.0.1
http://digital.ni.com/softlib.nsf/websearch/09F9367451DB38278625702D00673856?opendocument&node=132070_US
Your VB AI 2.5 should work with the 2.0.1 driver!
There is no specific sheet for VB AI, but it's recommended that you
have an Pentium III / Celeron 866MHz or equivalent for LV 7.x
regards,
ThSa