Never had much problems with activation, even on the phone.
This girl, cause she sounded very young, who helped me just asked right away what I had and said to me that it was a genuine Windows XP Professional OEM License and said after I hang up you will hear the code.
Punched that in and I was done.
You can rant all you want on XP, but if you know how to do XP right, meaning slipstreaming, it runs fine, not as good as Windows 7 though.
I have this running on my I7, it's even got it's swapfile disabled as this PC has 16GB of memory.
On a SSD this just goes and starts and hangs way less than XP.
I'm using it for about 2 years now and it has only done a BSOD while tuning (read: overclocking) the pc, in normal operation I have yet to encounter 1.
Yeah Windows 7 needs a bit more power, but hey, spent a few bucks on a good PC, not some cheap basic thing, and it will run untill your SSD starts showing MTBF, or better said, it's memory chips start degrading.