Solution:

• Boot from windows disk.
• At the Welcome to Setup screen, press R to repair.
• Press C to repair the Windows installation by using the Recovery Console.
• Type the number that corresponds to the Windows installation that you want to repair, and then press ENTER. For example, type 1, and then press ENTER.
• Type the Administrator password, and then press ENTER.
• Type the following commands,

Here, copy drive is your disk drive.
If you are prompted to overwrite the file, type y, and then press ENTER.

NOTE: In these commands, there is a space between the ntldr and c:\, and between
ntdetect.com and c:\.


Source: Microsoft