NTLDR is missing

  plok 20:08 02 Jul 2007

After a failed attempt to download an update to Zone Alarms and System Mechanic, I cannot boot up the computer (not this one). It won't load windows. I am using XP. It gets as far as the stage where it should be loading Windows but all I get is the above message and an instruction to press Ctrl+Alt+Del to restart and when I do, it reappears. Can anyone tell me what NTLDR is and where can I find it. Thank you.

  VoG II 20:10 02 Jul 2007

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