How to manually troubleshoot and repair the Windows 7 bootloader

Below are some steps and a link concerning the bootrec.exe file with Windows 7.  This option should be used after attempting to perform a “normal” repair via the Windows 7 disk.

1. Boot the machine in question via the Windows 7 installation disk.

2. Press a key when you are prompted.

3. Click Repair your computer.

4. Click on the operating system that you wish to repair and click Next.

5. In the System Recovery Options dialog box, click Command Prompt.

6. Type bootrec.exe.

The bootrec.exe /FixMbr writes a MBR to the system partition.

The bootrec.exe /FixBoot writes a new boot sector to the system partition.

The bootrec.exe /ScanOs scans all disks for installations that are compatible with Vista or Windows 7.

The bootrec.exe /RebuildBcd allows you to select the installations that you wish to add to the BCD store.

More information can be found at the link below:

http://support.microsoft.com/kb/927392