Microsoft has released a new update for Windows Server 2003 x64 Edition
>> Update for Windows Server 2003 x64 Edition (KB943295)
Install this update to enable support for the Storport Virtual Miniport feature. This update includes changes applied to the Storport driver since March 2007, and can be used in any Storport-enabled system, but is intended specifically if the Storport Virtual Miniport feature is required. After you install this item, you may have to restart your computer.
>> Update for Windows Server 2003 x64 Edition (KB943295)