Is Labour Prosecuting A Class War?
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No best answer has yet been selected by siriusblack. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.I depends what version of XP you are trying to install. If it is the BOXED or OEM version (as opposed to say the corporate version) then the license allows it to be put on only one PC.
Assuming it is a genuine version and has only been installed at that one PC then the activation should work.
If you have changed some of the hardware in the PC then XP may see it as a different PC, so assume you are trying to put it on another PC.
One of the options during activation is to do it over the phone so maybe you should do that (if you are happy that everything is legal).
If it is not legal software or a genuine number then note that Microsoft are getting much stricter about activation and now check that it is genuine software going on a PC that it is licensed for.
By sugestion would be to go down the phone route.