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Definition: NTLDR (NT Loader) is a small piece of software that's loaded from the volume boot code, part of the volume boot record, which helps your Windows XP operating system start.

NTLDR functions as both a boot manager and a system loader. In operating systems released after Windows XP, BOOTMGR and winload.exe together replace NTLDR.

If you have multiple operating systems installed and properly configured, NTLDR will show a boot menu when your computer starts, allowing you to choose which operating system to start.

A common startup error in Windows XP is the NTLDR is Missing error.

Also Known As: NT Loader
"Since I only have one operating system on my Windows XP PC, I never see the NTLDR boot menu."
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