Interestingly, when I typed "Bootrec" into Help, I got "0 results. No matter; the real scoop on its operation is contained in two Microsoft Knowledge Base notes [(LINKS here and here)].
The easiest path to Bootrec repair is to insert your Vista installation disk and fire up your PC. In reality, you might have to start your machine twice, if you can't get the disk into your drive fast enough to get it to boot from the drive. In such a situation, turn on the PC, insert the disk, and then turn the machine off. When you restart it, you're likely to get the message, "Hit any key to boot from CD or DVD." My advice: Hit any key.
You'll now be taken through the sequence I've captured in the accompanying image gallery. After a seemingly interminable delay for Vista to load up from the DVD, things will proceed fairly rapidly. Blow past the first dialog box, clicking "next" as if you planned to actually install Vista anew.
Be more deliberate with the second one, though. It posts up a big "Install now" in the center of the screen, and that's definitely not what you want to do. Instead, look toward the lower left, and click on "Repair your computer."
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 To cut to the Bootrec chase, click on "Command Prompt" in the "Choose a recovery tool" dialog box. Go to Photo Gallery |
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Next up will be a "System Recovery Options" box, which should identify your current Vista installation as the OS designated for repair. Click "next."
Finally, we cut to the chase with a dialog which asks us to "Choose a recovery tool." Here I should note that it's recommended that you try start-up repair, system restore, or the Complete PC refresh (discussed above), unless you've specifically received a Boot Configuration Data error message. To proceed with the Bootrec process, click on "command prompt."
At the prompt, enter "Bootrec /RebuildBcd" (without the quote marks). That should be sufficient in most situations. If the tool runs successfully, you'll be asked whether you want to add the entry it's created to the Boot Configuration Data store. Answer "Y" (yes), and then restart the computer.
If "Bootrec /RebuildBcd" gives you no joy, you'll have to proceed to a slightly beefier process involving the removal and subsequent recreation of the BCD store. The required command sequence is:
Bcdedit /export C:\BCD_Backup
ren c:\boot\bcd bcd.old
Bootrec /rebuildbcd
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