Ah yes, 3 easy steps to solving this (I've had it a number of times).
1) Find someone with Windows XP Home or Windows 2000.
2) Find their 'Autoexec.NT' file in system32
3) Copy it to your PC. It will not overwrite anything.
For whatever reason, this file was not included with Windows XP Pro. Always helpful to have a backup of it though, as Windows 'Disk Cleanup' sometimes deletes it again.
Trust me, I've done this many times before.
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