The same thing happened to me 2 years ago, the computer wouldn't boot cause of a missing NTLDR file, don't really think it's a exe. And yeah my brother deleted it!!! I was so stupid setting the folder options to display protected operating system files, and letting him use my pc. Right before writing this i deleted the NTLDR file without getting any message (and restored it of course) just to see if it was possible, how stupid from microsoft for not displaying the" Error deleting file or folder" message. Hope you fix the problem somehow. Sorry about the English.
