arrgh..there are lots of features in XP-32bit that are not supported in x64..
Features Not Supported in WindowsXP 64-Bit Edition
A number of features in WindowsXP Professional are not included
with WindowsXP 64-Bit Edition. The following is a list of these
features.
Digital Media
The following digital media features are not included with
WindowsXP 64-Bit Edition:
Digital video disc (DVD) video playback
CD Recording
Kodak Imaging Accessory
Windows Media? Player
A subset of Windows Media? Technologies
DirectMusic®
Microsoft TV Technologies for Windows®
Video mixing renderer (VMR)
NetMeeting®
IEEE 1394 audio
Fax
Subsystems and Protocols
WindowsXP 64-Bit Edition does not provide support for a number of
older subsystems and transport protocols, including the following:
Microsoft® MS-DOS® subsystem
OS/2 subsystems
16-bit subsystems
Portable Operating System Interface for UNIX (POSIX) subsystem
Legacy transport protocols
Internetwork Packet Exchange/Sequenced Packet Exchange
(IPX/SPX) LAN and WAN
AppleTalk Protocol LAN
Services for Macintosh
Data Link Control (DLC) LAN
NetBIOS Enhanced User Interface (NetBEUI) LAN
Service Advertising Protocol (SAP) Agent for Server
Internetwork Packet Exchange (IPX) router
Infrared Data Association (IrDA)
Open Shortest Path First (OSPF)
Network BIOS (NetBIOS) gateway
Mobile Computing
WindowsXP 64-Bit Edition does not provide support for features
aimed primarily at users of portable computers. The following
features are not included:
Hot docking/undocking
PC Card
IrDA
Terminal Services client for Handheld PC
Power Management
System Restore
The System Restore feature is not supported in WindowsXP 64-Bit
Edition.
Networking and Communications
The following networking and communications features are not
included in WindowsXP 64-Bit Edition:
Internet Locator Service (ILS)
MSN? Internet Access client
Message Queuing (MSMQ) Level 8 Listener
Windows Messenger Service
SharePoint? Team Services from Microsoft
Database
The 64-bit versions of these database engines and features are not
included in WindowsXP 64-Bit Edition;
32-bit versions of Microsoft
Database Engine (MSDE) and Jet RED are included.
Microsoft Database Engine (MSDE) 64-Bit
Jet RED 64-Bit
Microsoft Data Access Components (MDAC) Oracle provider
MDAC Oracle driver
MDAC Data Access Objects (DAOs)
MDAC Visual FoxPro® Driver
Dynamic Data Exchange (DDE) Share
System Administration
These system administration and management features are not
supported in WindowsXP 64-Bit Edition:
Winrep (Windows Report Tool)
Security Dynamics Access Control Entry (ACE) Agent
Windows Installer
Fast User Switching
Remote Assistance
File and Settings Transfer Wizard
Windows Product Activation (WPA)
Installation of Recovery Console on the hard disk; Recovery
Console can be run from the operating system CD
Search Companion
Speech recognition
http://www.microsoft.com/resources/d...a_fea_tfiu.asp