The last time I fell foul of the M$ validation system, I had a gaming tower that was behaving extremely problematically. This became so bad that I reinstalled 5 times in the space of one month.
Unknown to me, Windows XP Pro can only [b]BE[/b] installed a certain number of times in a given number of days (28 I think) so when I reinstalled for the 4th time, the install routine would not accept the Product Key AT ALL!
I then had to phone the Freephone Telephone Number on the installation screen, then FEED each bank of alpha-numeric characters into the touchpad on my phone - then have an answering-machine-voice read back my new numbers to me - [i]"Press * to hear again, Press # to continue to next set of numbers!"[/i]
So, when I ran Magical Jellybean for this thread, lo and behold the number sequence it came back with didn't match with the Product Key on the printed label.
THAT is all I meant. Unless you know the provenance of the unit you are dealing with, you [b]CAN'T[/b] assume that the number [b][i]WILL[/b][/i] match - but you [b]CAN[/b] be assured that it [b][i]IS[/b][/i] valid. ;)