Hi.. I'm currently running Windows 7 (64-bit) on a computer I got basically for Christmas from Walmart.. It's an HP.. but unfortunately my older mp3 players do not have software which interfaces with Windows 7.. though they can do just fine with XP. So I'm thinking of installing my copy of Windows XP Pro (32-bit) on an auxiliary hard drive so I can still use the mp3 players. Yet I need to know one thing. Is there some jumper or switch setting I need to set in order to make the processor run a 32-bit OS..? Or can I simply install Windows XP Pro without any real changes? Thanks for any help!