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Possible Duplicate:
How to get the Windows 7 bootloader back after installing XP, as well?

How can I freshly reinstall the bootloader? Using the tools bcdedit.exe, bootrec.exe, and/or bootsect.exe that come with Windows 7.

Assume that the bootloader is in an undefied state, it could be working or completely missing.

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marked as duplicate by Ƭᴇcʜιᴇ007, Sathya Jan 23 '12 at 7:58

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

To write a new boot sector on your system, try

bootrec /fixboot

But if it is damaged, you can use fixmbr to restore it

bootrec /fixmbr

Enter bootrec /? to see all the available options.

But for these commands to work, you might need to use the recovery command prompt booting from the Windows disc, then select Repair Your Computer, and from recovery options, choose Command Prompt.

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