FIX Windows Vista and 7 Boot manager

hi
if your windows vista or 7 boot manager is corrupted try some of the below methods to fix that

Method1: use Bootrec.exe tool
1. Put the Windows Vista or Windows 7 installation disc in the disc drive, and then start the computer.
2. Press a key when you are prompted.
3. Select a language, a time, a currency, a keyboard or an input method, and then click Next.
4. Click Repair your computer.
5. Click the operating system that you want to repair, and then click Next.
6. In the System Recovery Options dialog box, click Command Prompt.
7. Type bootrec /fixmbr to FIX Master Boot Record (MBR)
or bootrec /fixboot to FIX Boot Sector
or bootrec /rebuildbcd to rebuild Boot Configuration Data (BCD) store
and then press ENTER.

Method2 : sing DiskPart