sgtslappy -
I believe your correct in thinking it's the disk.
http://support.microsoft.com/default.aspx?scid=kb;en-us;331881
SYMPTOMS
When you try to install Windows XP, you may receive the following error message:
Manifest parse invalid at the top level of the document.
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CAUSE
This issue may occur if the Vctrl.man file that is on the Windows XP CD-ROM is damaged.
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RESOLUTION
To resolve this issue, use another Windows XP CD-ROM to install Windows XP. If this option is not available to you, contact the Microsoft Order Desk to order replacement media from Microsoft.
