|The error message "NTLDR is missing" means that the Windows boot loader (NT Loader, NTLDR) cannot be found. This often occurs when the computer tries to boot from a drive other than the one Windows is installed on, due to a change in the drive configuration or because you left a bootable disk in a removable drive. But it may also be because the NTLDR file has been corrupted or deleted.|
Please check the following things
* Check that there are no CDs or DVDs in the CD/DVD drives.
* Check that no removable drives are plugged in to the USB ports.
* Check the boot order in the BIOS Setup to ensure that the computer boots from the drive containing Windows before any other bootable devices.
If this does not resolve the problem, you will have to repair the NT boot loader.
And if all these fail then you will have to reinstall the OS and make sure to have a windows data recovery software to get your data back.