Well I dont know what is going on here exactly, but last week I changed from xp 32bit to w7 64 bit ultimate. Of course I had to reinstall Trackir software, so I downloaded it from the naturalpoint site and my Trackir4 was working like it always did. I also have the software running like it always did. I can create profiles etc.
I can't remember anything of clicking 32b or 64b options, I just installed it and it worked.