I have installed NPS (Ver. IL5, which can be downloaded from Samsung Mobile India website) on Win 7(32 bit) and it works fine.
Of course when you double click on the setup it tells stuff like 'OS not supported', and then you are given 2 options by Win 7 'Reinstall using recommended settings' and another one which I don't remember.
Just click 'Reinstall using recommended settings' and it will get installed and work like a charm(IL5 also backs up and restores the contacts, something which previous versions of NPS were incapable of). I have even used adb as well as Odin from Win 7(32 bit) and these tools also work well in it.