Installing SQL Server 2005 on Windows XP Pro x64

On MSDN, I have downloaded "SQL Server 2005 CTP - September 2005 - Enterprise Edition - 64-bit Extended - Servers (English)" that I am trying to install on WinXP Pro x64 (EMT64 machine).
Unfortunately, I am not able to install SQLSRV2005, indeed during the setup the option such as "SQL Server Database Services" are grayed (i.e. not clickable, idem for Analysis Services). The only thing that I can select is "Workstation components".
Is it possible to use SQL Server 2005 on a WinXP x64 OS ?
Thanks in advance,
Joannes
Enterprise Edition isn't supported on WinXP. Please see the following link for system requirements:

http://www.microsoft.com/sql/evaluation/sysreqs/2005/default.mspx