If you previously installed Service Pack 3 (SP3) via a web download, a backup copy is often stored at C:\WINDOWS\ServicePackFiles\i386\ntldr .
Yes. 64-bit (x64) editions of XP have a different NTLDR. Do not mix 32-bit and 64-bit boot files. The error will become HAL.dll missing or a blue screen. Ntldr File Download Windows Xp Sp3
The most reliable source is the i386 folder on an original XP disc. If you previously installed Service Pack 3 (SP3)
You cannot legally or safely obtain NTLDR today. Consider: Ntldr File Download Windows Xp Sp3