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Fixing the Windows 8 Bootloader

post #1 of 9
Thread Starter 

So I recently had to move some things around in my case including the sata cables (and I know I put them back in the proper ports because they are labeled and I took photos) and now Windows 8 bootloader is not letting me boot into either of my Windows 7 drives. I can force the Windows 7 drives to boot via my UEFI bios and selecting the HDD I want, and Windows 8 will boot from the bootloader just fine so I know the installs aren't borked. What's the easiest way to clear the bootloader of the misdirected OS entries and reestablish the Windows 7 installs on it.


Edited by phazer11 - 3/9/14 at 10:43am
     
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post #2 of 9
have you tried using BCDEdit to export the current settings to a file.. where you can modify them, and then use the import the file? Hopefully the config info is still there, and just needs to be cleaned up.

You might find this handy: http://technet.microsoft.com/en-us/magazine/ff404185.aspx

http://technet.microsoft.com/en-us/library/cc709667%28v=ws.10%29.aspx
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post #3 of 9
Thread Starter 

First off thanks for the reply, I'm trying to re-add the windows 7 installs to the windows 8 bootloader. Windows 8's bcdedit just pops on screen for a second and disappears.

     
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post #4 of 9
try opening up a dos prompt (preferably elevated) and then type BCDEdit... it won't go away that way!

Start / Run or the search bar wont work for dos apps
Edited by cgipson1 - 3/9/14 at 1:10pm
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post #5 of 9
Quote:
Originally Posted by cgipson1 View Post

have you tried using BCDEdit to export the current settings to a file.. where you can modify them, and then use the import the file? Hopefully the config info is still there, and just needs to be cleaned up.

You might find this handy: http://technet.microsoft.com/en-us/magazine/ff404185.aspx

http://technet.microsoft.com/en-us/library/cc709667%28v=ws.10%29.aspx

I tried this just now, exporting the current BCD store to a file. I did it like this:

bcdedit /export "BCD export"

It creates four files and the folder where I did it looks like this:
Code:
D:\t>dir /a BCD*
 Volume in drive D is Main
 Volume Serial Number is 4455-AB1A

 Directory of D:\t

2014-03-09  21:22            28.672 BCD export
2014-03-09  21:22            28.672 BCD export.LOG
2014-03-09  21:22                 0 BCD export.LOG1
2014-03-09  21:22                 0 BCD export.LOG2
               4 File(s)         57.344 bytes
               0 Dir(s)  29.450.625.024 bytes free

Looking into those files, they are not text files. They are some sort of binary format. I don't know how to edit those. I'm guessing to edit the BCD store, you really have to learn how to use bcdedit's command line parameters, which seems pretty annoying.
post #6 of 9
Thread Starter 

Ok it's showing me the same drive listings as when I looked in the System Configuration Boot settings. But it still doesn't help me change it. I'm not seeing anything that will help me re-identify the drives. I'm trying to go for something like what would happene when the bootloader is first installed it'd autodetect the installs.

     
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post #7 of 9
Using the SET commands, you can restore your boot configuration.. but it is a bit cryptic. Especially if you don't have a copy of the original BCD to work with.

this might help you more... http://www.boyans.net/DownloadVisualBCD.html <- it even has a built in Dual boot repair function.

Autodetect? Have you tried bootrec /rebuildbcd from a system recovery command prompt?... that will search for any existing windows installs... and rebuild the BCD.

This might help: http://pcsupport.about.com/od/fixtheproblem/ht/rebuild-bcd-store-windows.htm
Edited by cgipson1 - 3/9/14 at 2:03pm
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post #8 of 9
Quote:
Originally Posted by deepor View Post

I tried this just now, exporting the current BCD store to a file. I did it like this:

bcdedit /export "BCD export"

It creates four files and the folder where I did it looks like this:
Code:
D:\t>dir /a BCD*
 Volume in drive D is Main
 Volume Serial Number is 4455-AB1A

 Directory of D:\t

2014-03-09  21:22            28.672 BCD export
2014-03-09  21:22            28.672 BCD export.LOG
2014-03-09  21:22                 0 BCD export.LOG1
2014-03-09  21:22                 0 BCD export.LOG2
               4 File(s)         57.344 bytes
               0 Dir(s)  29.450.625.024 bytes free

Looking into those files, they are not text files. They are some sort of binary format. I don't know how to edit those. I'm guessing to edit the BCD store, you really have to learn how to use bcdedit's command line parameters, which seems pretty annoying.

I didn't mean to try an edit as a Text file.. I meant make the back up first.. edit that using the set commands, instead of working directly with the working BCD. Too easy to render the pc unbootable if you screw up. lol! Yea... BCDEdit is a pain, until you need it. And then it can save your butt! wink.gif
Edited by cgipson1 - 3/10/14 at 4:04pm
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post #9 of 9
Just wondering if you got this fixed?

If you need further help, let me know.

VisualBCD will let you create new bootloader entries... and is pretty easy to use. I have never used the Dual Boot repair app... but it is supposed to work pretty well.

The system recovery options might be your best bet.... BootRec works pretty well. Here is a list of commands if you need them: http://support.microsoft.com/kb/927392
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