Windows XP Professional 32-bit on a 64-bit machine?

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I am not sure if this has been answered before; if it has, sorry!

Since Microsoft has not given a final date for the release of Win XP Prof
64-bit, I have been trying to set up my new machine with Win XP Prof (32-bit)
SP2. This machine is a dual processor Intel Xeon 3.60 with EM64 running on a
Supermicro X6DAE-G2 motherboard.
The first part of the installation (text-based) works fine, but at the
beginning of the second (before the device installation), I always get a
fatal error message:

SXS.DLL: Syntax error in manifest or policy file...
A component's file does not match the verification information.

Each time (I have tried several!) is a different file that fails the check.
In desperation I tried my old Win 2000 Prof, and it actually managed to
install! But, when I started to install software, I noticed that all
installers that tried to check (CRC32 check, probably) the consistency of the
files all failed, and after a while the system started to crash. In one
instance, I got a PFN_LIST_CORRUPT BSoD, and after checking the Knowledge
Base I realized it had something to do with the memory. Then I tried to
install Win XP Prof (32-bit) again, but disabling all memory caching: the
installation passed the checks and started to install devices, but it was so
slow (without memory caching, you bet) I quit after 3 hours.

Now, I have a doubt: do I have a broken motherboard and/or dodgy memory, or
is Win XP Prof (32-bit) known not to work on Intel Xeon 64-bit systems? I
cannot wait to find out until Win XP Prof (64-bit) comes out because of the
returns policy of my suppliers.

Thank you for your time,

F. David del Campo Hill
.

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