Some copies of Windows XP balk after so many activations on the same
PC within 120 days. I had one copy of Home that balked after a few
times .. yet I had another that I could activate over and over again
until the cows came home .. Why one balked I don't know .. it might
have been some reason with my hardware .. maybe I inadvertently
changed some bios configuration that made it seem like a new set of
hardware to the product activation algorithm.
However, technically, as long as you have a legitimate copy you can
activate it on the same set of hardware as many times as you want. If
activating by Internet ever fails then you need simply phone. Tell
them the 50 digit number necessary for activation - that's all they
need know:
Microsoft's own words: "The only information required to activate is
an installation ID (and, for Office XP and Office XP family products
such as Visio 2002, the name of the country in which the product is
being installed.)"
http://www.microsoft.com/piracy/basics/activation/mpafaq.asp#details
Windows Product Activation only exists to discourage casual copying
by the home and small business user. It doesn't stop dedicated
pirates and it isn't locked down .. heck after 120 days the thing
resets so one could conceivably install the copy on a second computer
then and have it activate over the Internet without a hitch.
Before all this, Microsoft operating system software was completely
on the honour system. Now it is 'sorta' on the honour system 'sorta'
portected by Windows Product Activation. I can't see why anyone would
blame Microsoft too much for providing some protection to their
intellectual property.