If we buy Microsoft Windows XP Professional upgrade software from CTX will this install itself on to a computer which already has Windows XP Professional installed but we no longer have the original discs?  The computers do have legitimate licenses which were bulk purchased when the computers were new but we have lost the product key and license details. We know Microsoft has a process to get the information but so far its proved too complicated and hasn't worked so we would like to start again with good legal discs that we can install if we have any problems such as hard disc failures.

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