If it's the only XP disc you have then not such a good idea, as it's illegal to have the same copy of Windows installed on two PC's.
Is the Windows 2000 cd scratched at all? Can you try to clean the disc (
How to Clean CDs | eHow.com), and then try again?
If we can't get you up and running on 2000, we always have 98 to fall back to, but would really like to get you running on 2000.