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When your computer does not start, it can be beyond frustrating, I know. Your answer is one of a number of solutions, though start with this; repair Windows 7 master boot record.
Starting with the repair of your MBR is most appropriate, as the master boot record, MBR, is the first thing your computer uses to startup. So if it is corrupted, or missing, you will not boot properly.
Follow these steps to rebuild, or repair your MBR involves using Windows Recovery Environment. Prior to utilizing Windows RE, however, you should first try the Startup Repair option, under System Recovery Options menu. Please refer to the following article: Run Windows 7 Startup Repair. If this does not work, then move forward with the MBR solutions.
The main utility that we will be using in the Windows RE, is called bootrec.exe. This utility is used to repair or rebuild the master boot record, boot sector, or the Boot Configuration Data (BCD) store. The following directions come directly from Microsoft’s KB article 927392.
The bootrec utility can be used, as mentioned above, to rebuild the master boot record, fix it, or create a new boot sector. Here are the following commands and their use.
This bootrec command helps in fixing corruption issues with in the MBR, though it is not used to overwrite the existing partition table.
This command is used to write a new boot sector to the existing system partition.
This command can be used to scan the disk and display system entries that were not visible to the Boot Manager menu. This command comes in helpful when in the case that the Windows system you are wanting to boot to does not appear to be valid.
You can utilize this command that will scan all operating system installation files that are compatible with Windows 7. Utilize this option to completely rebuild the BCD.
When you have used any or all of the commands above, you would need to shutdown your computer and reboot to see if the problem has been resolved. If you can boot normally, then you will have discovered the cause of your computer not starting was a corrupted or missing Windows 7 master boot record, boot sector, or BCD. You should now be able to resume normal activity.