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Wenn Hopfen und Malz verloren ist, und Windows Vista oder Windows 7 einfach nicht mehr booten möchte, da diese man evtl. von einer anderen Harddisk her gesichert hat, ein DualBoot System oder nebenbei an der BCD herumfingert, hilft meisten eine “Reparaturinstallation”, wobei letztere Bereichnung seit NT60 ausfällt.

Eine Reparatur über Windows Vista / 7 DVD zu starten, kann in den meisten Fällen schon helfen, es werden standardmässig div. Strukturen an Disk und BootLoader geprüft.

Manuell lässt sich dies bereits in der CMD (wenn man die Recovery Environment, sprich VistaPE auf der Windows DVD, gestartet hat) erledigen:

• CMD öffnen mit SHIFT+F10
• bootrec.exe /fixboot
• bootrec.exe /fixmbr

Wie man die Befehle von früher aus XP’s Recoveryconsole her kennt.
Muss aber ein Bootloader komplett neu erstellt werden, hilft diese gefundene Anleitung (übrigens von den Machern von EasyBCD, ein GUI für bcdedit.exe)

Alles gefunden auf: http://neosmart.net/wiki/display/EBCD/Recovering+the+Vista+Bootloader+from+the+DVD

Step Four: Nuclear Holocaust

Windows Vista doesn’t have its share of haters for no reason: when the going gets tough, the tough gets going.

So Windows Vista can’t even fix itself – god, that’s what we love about EasyBCD! If you were in Windows Vista right now, you could have used EasyBCD’s “Reset BCD Data” feature to have EasyBCD actively search for any and all discrepancies in your bootloader, zero out your old BCD data, and re-create it all from scratch. But you’re not and it’s no use lamenting what you could be doing with our super-cool app if you can’t even use it in the first place now, is it?

Go ahead and select “Command Prompt” yet again from that list. Roll up your sleeves, and prepare to be tortured.

The first order of business is to make sure the MBR and bootsector contain the right references to the Vista bootloader:

Replace x: in the commands below with the letter to your CD drive as detected by the Windows Recovery environment

bootrec.exe /fixmbr
x:\boot\bootsect.exe /nt60 all /force

Now we get rid of the old BCD registry, and create a new one instead.
Note: We’re assuming that the boot drive is drive C: below. If your computer is configured differently, be sure to use the appropriate drive letter here instead.

del C:\boot\bcd
bcdedit /createstore c:\boot\bcd.temp
bcdedit.exe /store c:\boot\bcd.temp /create {bootmgr} /d "Windows Boot Manager"
bcdedit.exe /import c:\boot\bcd.temp
bcdedit.exe /set {bootmgr} device partition=C:
bcdedit.exe /timeout 10
del c:\boot\bcd.temp

Now we have a clean, working Vista bootloader. But we need to add a Vista entry to it:

bcdedit.exe /create /d "Windows Vista" /application osloader

bcdedit.exe should return a message with a GUID for the newly-created entry, something like this:
The entry {c0dfc4fa-cb21-11dc-81bf-005056c00008} was successfully created.

You’ll need to use the value that bcdedit.exe returned for you below, along with the drive letter for the drive that Windows Vista is installed to:

bcdedit.exe /set {c0dfc4fa-cb21-11dc-81bf-005056c00008} device partition=C:
bcdedit.exe /set {c0dfc4fa-cb21-11dc-81bf-005056c00008} osdevice partition=C:
bcdedit.exe /set {c0dfc4fa-cb21-11dc-81bf-005056c00008} path \Windows\system32\winload.exe
bcdedit.exe /set {c0dfc4fa-cb21-11dc-81bf-005056c00008} systemroot \Windows

And, last of all, tell the Vista bootloader to boot the new entry by default:

bcdedit.exe /displayorder {c0dfc4fa-cb21-11dc-81bf-005056c00008}
bcdedit.exe /default {c0dfc4fa-cb21-11dc-81bf-005056c00008}

Now the Vista bootloader has been nuked and rebuilt from scratch. If you got this to work, feel free to consider yourself one of the finest graduates of the NeoSmart Technologies Institute of BCD Learning.

At this point, you have a clean, untouched, and (hopefully) fully-working bootloader with one entry for Windows Vista. Go ahead and reboot your PC, get into Windows Vista, and use EasyBCD to further tweak the bootloader to your heart’s content. We advise backing up the BCD registry immediately with EasyBCD before making any changes.

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