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Pangasinan,
Have a look at the bottom of this page: http://www.microsoft.com/windowsxp/pro/howtobuy/default.mspx
MS has authorized LTG to sell product keys. Looking at the info at this link, http://www.microsoft.com/products/info/product.aspx?view=22&type=ovr&pcid=2abf99cd-a5e4-469c-802e-55ca8ec542d5, it looks like you can order an additional license and use the genuine CD that you have now.
If your installed XP is coming up as not genuine, it's cheaper to take the Genuine Windows Offer.