Using Bootrec.exe Tool In Windows Recovery Environment

A Boot Configuration Data (BCD) store
To run the Bootrec.exe tool, you must start Windows RE. To do this, follow these steps:
Put the Windows Vista or Windows 7 installation disc in the disc drive, and then start the computer.
Press a key when you are prompted.
Select a language, a time, a currency, a keyboard or an input method, and then click Next.
Click Repair your computer