I'm gettin a new XP disc (since windows says i may be a victim of conterfieting ). Well i have XP Pro right now but i dont want to dish out $200 for it on Newegg so i've decided to go with Home. Well theres a $100 difference between XP Home Upgrade VS. XP Home with SP2. Now i have XP Pro, so will the Upgrade version work since already have XP. At start-up right now it asks me to get a genuine version of windows so do you think if i get the upgrade version it'll work?