microsoft has a db of over 80,000 keys, when you try to activate it checks against versions of these.
reinstall xp without reactivating
If you were to reinstall Windows XP, you normally must re-activate it as well, even if your hardware is unchanged... luckily, there's a way around this.
First, your hardware between reinstalls must NOT change..
XP keeps the activation information in a file named "wpa.dbl", which can be found in _:\WINDOWS\System32\
After your activating Windows XP, back this file up to a floppy or some other type of media.
Now, if you ever need (or want) to reinstall Windows XP, go through the whole procedure as you normally would. Once you get into Windows itself, copy the file from your media back into _:\WINDOWS\System32\... You may need to be in safe mode to do this,
Death has a thousand doors, let's see which one our victim chose.
"There's one thing that you learn on this job, is that human beings are capable of anything"
If you chase two rabbits, you lose them both
You say tomato... I say cause of death