Forgive my reading at 90k.p.h. & I misread things, but did I read correctly that even after you've registered XP, if you've installed another "X" number of programs eg; a few games,Anti-virus, WinAmp etc. that XP demands you go to MS's site again?!
It's one thing for any "auto-update" features, but it's quite another if they want your system & program specs too, unless I have a tech-support issue, it's no company's business what your PC has.