Hi oevidneg,
If you need to check your software versions programattically in LabVIEw you can do so using the System Configuration API, but I don't think that functionailty is available in the NI-VISA API. Otherwise, you can use the links below to find installed version numbers for your NI software:
http://digital.ni.com/public.nsf/allkb/2266B58A5061E86A8625758C007A4FE3
http://www.ni.com/pdf/manuals/321519b.pdf