Sounds like a corrupted install. NTLDR basically means it doesn't know how to boot from your hard drive.
if you don't have files that are important you can do a reinstall, or if you have files you want, you can plug the hard drive into another computer and copy those files to the good computer, or create a partition when you're installing and it'll save your files.
let me know if you need help with any of those steps.
Hope this helps.