While what AM-ITgeek said is true, I don?t think the solution is that drastic. First, do you have a backup? You should. If not, do you have any friends who do? This problem is a simple matter of copying ONE file back onto the hard drive, but unfortunately, the only way you can copy the file is to run a good backup program in DOS mode (BEFORE Windows boots up) and then restore the file.
After you restore that ONE file, you should be able to boot up again?unless there is something else wrong with your computer. This same problem happened to one of my sons when he decided to delete files that he thought were unnecessary, and that?s the solution that I had him use, but we have a rule in our household to always have a backup.
Another method you could use, if you have another computer, is to take the hard drive out of this computer and put it in that other computer as a SLAVE, and then simply copy that file onto the hard drive. Then put it back into your computer and it should work again.
The file is found in the root directory and there is no dot plus 3 extension, so it does not end with .exe .com, .dll, or anything else. To simplify that, it is found at C:\ntldr.
There is one more simple problem. By default, Windows hides this file and other system files, so you have to unhide them to see this file on the second computer. To unhide these system files, open either Windows Explorer or My Computer, click on the Tools drop-down menu, and choose "Folder Options", click on "View", and then click on "Show hidden files and folders" and "Hide protected operating system files" so that there is not a check in the checkbox.