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Windows 7: windows 7 boot loader missing/corrupt

01 Nov 2010   #1

Windows 7 Ultimate x64
 
 
windows 7 boot loader missing/corrupt

I recently Uninstalled my Ubuntu 9.10 partition from my 500gb IDE hard drive, and thought nothing of formatting the partition and setting it up as a new windows drive.
But, out of my own forgetfulness, i forgot that in rder to dual boot windows 7 with ubuntu, you Have to install the GRUB boot loader to be able to boot into both at will. this process wipes the original windows bootloader, and simply replaces it. Well, once I rebooted my pc, GRUB attempted to find a linux partition that was not there, and gave me this: "Error:unknown filesystem. Grub rescue>"
After some online digging, I found several articles that told me to use the "repair" feature on the windows 7 install disc. I did this, and the Disc was unable to find my windows 7 installation, although when i used the x:/ command prompt, i was able to easily see the C: drive,and the windows system. When i used the "repair startup" command, it ran through and told me that it was unable to fix the error, and that the root was that the Bootloader was missing or corrupt.
I think this is an error caused by what i think to be the real root dilemma, when my hard drive is physically set as the first boot device, the CD-rom drive is undetected by the BIOS, and vis versa, although when the CD-rom is set as the first, im able to boot into the windows 7 install CD. Im not sure if this is due to my BIOS being outdated, or what could cause this-but i believe its causing the cd to not see the drive as a boot device, or a win-7 installation.
Any help would be greatly appreciated, I have scoured these forums, and worked for hours on my own to no avail.
all suggestions are appreciated.
Thank you for reading this small book i seem to have typed.


My System SpecsSystem Spec
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01 Nov 2010   #2

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, clean install, upgrade disc
 
 

Is this what you are missing?
MBR - Restore Windows 7 Master Boot Record
My System SpecsSystem Spec
02 Nov 2010   #3
Microsoft MVP

W 7 64-bit Ultimate
 
 

Hello chbell10, welcome to Seven Forums!



You can see an out-line of the partition specific wipe process at Option Three of this tutorial at the link below; there is also additional useful information at the second link and be sure to post back with any further questions you may have and to keep us informed.


Partition Wizard : Use the Bootable CD

Startup Repair - Run 3 Separate Times
My System SpecsSystem Spec
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02 Nov 2010   #4

Windows 7 Ultimate x64
 
 

I tried all of the solutions listed above, and again to no avail. I wiped the Drive which previously had grub on it with the bootable CD, and marked the windows 7 drive as active, and that did nothing for the repair tools to see the installation, although when i followed the link provided by Richc46, it showed that there was indeed a win 7 ultimate installation in place, alas when i ran the command "bootrec /rebuildbcd", it told me that "the requested system device cannot be found".I also ran the repair 3 times with reboots, but that only gave me the new root error "NoOsinstalled", which is very contradictory of it to say,I think -_____-
I forgot to mention before, but this might be of some help, when at the basic first screen of the windows 7 DVD,
I select "repair my computer", It proceeds to a progress bar window, which says on it "searching for windows installations", which then proceeds to a dialogue boxt stating "windows found problems with your computers startup options. Do you want to apply repairs and restart your computer?", and i then select "repair and restart", which promptly gives me an error dialogue box saying "failed to save startup options", which then proceeds to the section where you choose your windows installation, but in my case-it shows nothing at all.
Maybe that will help a diagnosis.
Thank you for your help, and time(:
My System SpecsSystem Spec
02 Nov 2010   #5
Microsoft MVP

 

Boot the Windows 7 DVD, press Shift F10 to open a Command Line, type:

bootrec.exe /fixmbr
bootrec.exe /fixboot

Close command line, enter Repair console to see if it now finds an installation to repair and will Startup Repair correctly.

What you are doing here is jump-starting the Repair by preceding it with bootrec commands which are automated in Windows 7 Startup Repair, but which may not be completing if it is malfunctioning due to OS corruption.

In the future, consider putting Linux distribs on a separate HD booted via BIOS so that GRUB is not necessary and Windows 7 isn't involved. Backup a Windows 7 image externally so that you never have to reinstall again.
My System SpecsSystem Spec
02 Nov 2010   #6

Windows 7 professional x86/
 
 

Firstly - I have removed grub with the simple bootec.exe /fixmbr 100% of the time.

So from the top - make sure SATA native mode is disabled in your BIOS (device config)

Installation DVD - R - Command

bootrec.exe /fixmbr
bootrec.exe /fixboot

bcdedit /export C:\BCD_Backup
c:
cd boot
attrib bcd -s -h -r
ren c:\boot\bcd bcd.old
bootrec /RebuildBcd
My System SpecsSystem Spec
02 Nov 2010   #7

Windows 7 Ultimate x64
 
 

I tried your suggestions, but There was no change in the repair error. It says that "startup repair cannot automatically repair this computer"

Would any other information be helpful in any way to solving this?
if so, please let me know, and I'll do my best to oblige.
My System SpecsSystem Spec
02 Nov 2010   #8

Windows 7 Ultimate x64
 
 

And to solarwind, This is the error i got when i used the command listed:
"bcdedit /export C:\BCD_Backup"-The store export operation has failed. The requested system device cannot be found.
My System SpecsSystem Spec
02 Nov 2010   #9

Windows 7 professional x86/
 
 

This is quite a problem!

Tak a look at the following: Windows 7 Suddenly Won’t Boot – Reboot and Select Proper Boot Device or Insert Boot Media in Selected Boot Device and Press Any Key – Repairing the Windows 7 Bootloader Russ' Do It Yourself Home Workshop


Follow the instructions from where it says additional actions i.e DISKPARTand fingers crossed this solves it. Other than that I am totally out of ideas so could only recommend a complete reinstall.

My System SpecsSystem Spec
02 Nov 2010   #10
Microsoft MVP

 

All of those bootrec and bootsect commands are automated in Windows 7 Startup Repair, along with dozens of other tests and fixes which require it sometimes to be run up to 3 separate times with reboots to complete MBR repairs.

However, as implied earlier bootrec can sometimes jumpstart the Repair utility if no installation is found to begin with.

Some installations cannot be repaired, especially ones corrupted by GRUB. I will often go on running Startup Repair anyway and sometimes get it running but at some point you may want to cut your losses, wipe your HD and clean reinstall the OS's to separate drives if at all possible. If not: Where to install ubuntu in my system?

You can copy out your files if necessary using the DVD with this method: Copy & Paste - in Windows Recovery Console
My System SpecsSystem Spec
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 windows 7 boot loader missing/corrupt




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