WinXP64 1218 image non bootable

Hi all! I hope this is not a FAQ but I've downloaded three times the
image of the CD for new WinXP64 before asking here. My problem is that
the CD burned from this image is non-bootable and if i try run setup in
WinXP 32 i get an error box telling:

"Welcome to Windows XP has encountered a problem and needs to close. We
are sorry for the inconvenience."

A strange fact is that the name of image file is
w2k3sp1_1218_usa_x64fre_pro.iso and for a couple of days before i was
able download it first time, download page was offline.
Have i downloaded the wrong image?

Thanks in advance for your help
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