I have one 9.0 entry. Surprisingly enough all the links point to "\program files\national instruments\labview 2009" - 64 bit version,
but all the packets got installed to 32-bit version which resides at "\program files (x86)\national instruments\labview 2009"
Ha, I think I know what the answer is: 64 bit and 32 bit applications use different parts of registry, see say Microsoft KB
So, when I launch VIPM it gets launched using the 32bit LabVIEW runtime engine. So it sees under "HKEY_LOCAL_MACHINESOFTWARENational InstrumentsLabVIEW", what a regedit (A 64 bit program) sees at: "HKEY_LOCAL_MACHINE SOFTWARE Wow6432Node National Instruments LabVIEW". There are 2 entries for 8.6 and 9.0.
Hope it helped.
Be happy to help you guys figure this out for the benefit of the community.