Keep in mind that the key changing method doesn't always work, I already tried it for the exact same reason.
There appears to be more than one version of Windows XP Pro. There is "Retail" and "OEM". There are situations where keys from one product version doesn't work on others.
For the legitimate key to work you need to make sure that your cracked version of windows will be able to use the new key, orelse you may end up with a useless new version of windows.
I contacted Microsoft's support for an official answer on the issue. They informed me there are in fact three versions of Windows XP Pro and one cannot use keys from one on another.
I actually returned my new legitimate version of windows and keep using the pirated one since I am too bored to format my PC right now...
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Keep in mind that the key changing method doesn't always work, I already tried it for the exact same reason.
There appears to be more than one version of Windows XP Pro. There is "Retail" and "OEM". There are situations where keys from one product version doesn't work on others.
For the legitimate key to work you need to make sure that your cracked version of windows will be able to use the new key, orelse you may end up with a useless new version of windows.
I contacted Microsoft's support for an official answer on the issue. They informed me there are in fact three versions of Windows XP Pro and one cannot use keys from one on another.
I actually returned my new legitimate version of windows and keep using the pirated one since I am too bored to format my PC right now...