Windows XP activation

Excuse me, I got COA tag with my new computer and shop assistant told me,
that I can use it with every CD of Windows XP Proffesional. So I installed
Windows XP Prof. and downloaded program (from http://microsoft.cz ) to reset
Product Key. I ran it, inserted Product Key, but it showed error. I restarted
PC and System told me to activate. So I ran activating program, and inserted
Product Key. Only response was, that activation program said me, it couldnt
activate widnows, and that, I have to call support. I rather ask here. Do you
know, what is wrong?

Thank for help.
.

Relevant Pages

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