Sunday, September 6, 2009

Fix MBR in Windows Vista

If your hard drive encounters a serious error (perhaps a failed operating system install, corruption or a virus) then you may get an "Error Loading Operating System" message on boot.

This often means that you have a corrupt Master Boot Record (MBR) which can be fixed with the Vista repair tool. This should be one of the first things done to resolve the above error message, as performing a format and reinstall will cause a loss of data.

First, insert the Vista DVD into the computer and restart it (to start the boot process). You will be asked to press any key to boot from the DVD:



Then, fill in the language and location options and click Next:



Now, click Repair your Computer:



Then, select your Vista partition and click Next



Select Command Prompt from the system recovery options window:



Once you are at the command prompt, run the following commands:



Bootrec.exe /fixMBR
Bootrec.exe /fixBoot




The first command fixes the Master Boot Record, and the second fixes the Boot Sector (just in case it is also damaged).

You can now close the command prompt, remove the Vista DVD and click Restart. This should reload Windows with a repaired MBR:


You may have noticed there was a "startup repair" option in the Vista boot application. This may also be able to fix your startup problems, but this slightly longer method will fix MBR problems.

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