I'm maybe wrong, but I suppose this second version of Windows XP will be the XP 64 bits. I think that, effectively, it will be a very good purchase. The only thing that can cause problem with this version, if I understand what a friend told me, is that you will need the drivers of all the components of your computer in 64 bits. It will be easy if you have standard components (ATI, NVidia, CreativeLabs, Asus, etc...) but less sure with 'exotic' ones (Shuffle's motherboards, for example...). And, the last think, is that W XP64 will be worth the money if you plan to acquire a AMD Athlon 64 bits...