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The easiest way is to put your operating system disk in the computer and do a repair.

If you have XP, then it is a nightmare and to long to explain, your better off, doing a install

of the OS, then making sure system restore is on and making a restore point.

But if you want to try and you have XP, below ill post a repair for the boot.

http://pcworld.about.com/magazine/2111p196id112479.htm

This is for recovery console.

http://support.microsoft.com/kb/314058

Vista and windows 7 are very easy to fix the MBR, you just put in the disk and it will repair it for you.

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14y ago
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2w ago

You can often fix a missing or corrupt boot sector by using the "bootrec" command in the Windows Recovery Environment. You can access this environment by booting from a Windows installation media. In the command prompt, type "bootrec /fixboot" and "bootrec /rebuildbcd" to rebuild the boot sector and repair the boot configuration data.

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