I am about to finish construction on 2 new computers (build specs are in my signature). I know I have to run XP to use the hyperthreading feature of the boards & processors. I have a XP Home upgrade, but not the origional install software. To use what I already have, I'd have to install 98SE and upgrade to XP Home. Should I install 98SE and upgrade to XP Home or buy a new install XP? If I buy, which XP is best - Home($91@newegg), or Pro($135@newegg)? (I use my computers on a LAN with a total of 5 computers for broadband internet access and multiplayer gaming.) What would the benefits of XP be over 98SE or ME, and would they even run in this system with, for example, the SATA drives (besides hyperthreading)?