Possible to downgrade from MCE to XP?

Hey, my current computer is a Windows Media Center Edition rig, but the thing is, I bought the Razer Copperhead mouse for it and it doesn't work on this Operating System. I was curious if there is a way to downgrade down to XP Pro so I can use it? I have a XP Pro cd with the key if that's any help. It's the cd I have since I've have my first computer with XP on it. Thanks a bunch.