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I have an aquaintance that did beta testing on XP and was very impressed with it. However he states that unlike previous Windows Operating Systems, this product can only be installed on a single system and should you "upgrade" the computer in a manner that will require re-installation of Windows XP you will not be able to do so without contacting Microsoft and getting a new "code". Microsoft will determine whether or not you will be able to re-install. If they do not allow you to do so, then you'll be forced to purchase another copy of XP. Also, this means should you have two systems (e.g. desktop & laptop) you will be required to purchase two operating systems. I think this is a big error on Microsoft's part since most "home" users are not the problem in copy protection violations. A two hundred dollar investment for home use seems to be exorbitant.