Fix #3: Use bootrec.exe to rebuild the BCD
bootrec.exe is a tool built in the Windows Recovery Environment (Windows RE) that you can use to troubleshoot and repair the error.
bootrec.exe can repair boot configuration data and master boot records. BCD, which stands for Boot Configuration Data, contains boot configurations options and controls how Windows is started.
Here are the steps for accessing bootrec.exe to rebuild the master boot sector:
Insert your Windows 7 or Vista install disc
Restart your computer and boot from the CD
Press any key at the “Press any key to boot from CD or DVD” message
Choose Repair your computer after you select the language, time and keyboard method
Select your Windows installation drive (usually C:\)
Select Command Prompt in the System Recovery Options box
Write the following command and press Enter:
Fix #4: Run System Restore