Re: NTLDR is missing
Your NTLDR was corrupted during the second install.
You can try this: Boot up your XP installation CD and go into Repair mode. Copy the files ntldr and ntdetect.com from the /i386 directory of your CD to the root of your primary drive, then reboot your computer (without the install disc in the drive).
When installing XP be sure that you have no extraneous USB devices (that includes wireless mouse dongles) plugged in during installation. I can't tell you how many times that has hung me up during an install.
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