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Windows 7: Which MBR fix is correct?

28 Jan 2014   #1
markg2

Windows 7
 
 
Which MBR fix is correct?

My wife's computer periodically issues 'bootmgr is missing' on boot. I use an Acronis boot disk in those instances to successfully load Windows. Norton comes up clean and so does Malwarbytes. I ran the Norton Eraser in the event there was a rootkit problem and it too came up clean.

Therefore I'm assuming there's something messed up with the MBR.

I've researched repairing the boot loader and found 2 similar but different command prompt commands and wish to get a clarification here before I proceed.

Method 1: Select command prompt from the system recovery options on the OS disk. Type 'bootrec /fixmbr' to restore the master boot record.

Method 2: At the command prompt, successively type each of the following commands followed by a CR:
bootrec /FixMbr
bootrec /FixBoot
bootrec /RebuildBcd

?

Mark


My System SpecsSystem Spec
.
30 Jan 2014   #2
andrew129260

Windows 10 Pro
 
 

See this walk through tutorial:

MBR - Restore Windows 7 Master Boot Record
My System SpecsSystem Spec
31 Jan 2014   #3
mjf

Windows 7x64 Home Premium SP1
 
 

For Windows 7 I would opt for the method 2 / bootrec approach.
My understanding is that Bootsect is still supported more for backward compatibility (eg. to include NTLDR boot loaders in dual boot W7 / XP) and doesn't do everything bootrec does.

http://technet.microsoft.com/en-us/l...=ws.10%29.aspx
http://support.microsoft.com/kb/927392
My System SpecsSystem Spec
.

31 Jan 2014   #4
smarteyeball

 
 

+ another for Option 2
My System SpecsSystem Spec
31 Jan 2014   #5
markg2

Windows 7
 
 

I followed through Andrew's link and sort of come back to a tangent of my initial question.

Although, practically it may not be, browsing through the screens step by step the procedure conveys a sense of having a ton of steps and a procedure that could (when doing for the first time) could lead to failure by way of user input error.

At the very end of Andrew's link, a screenshot says: "NOTE: If this method fails to restore the MBR, you can try the bootrec command as it is also a tool for repairing the MBR.", which to me, begs a variant of my initial question: WHY go through all of Andrew's steps if all I have to do is simply type:

Method 1: Select command prompt from the system recovery options on the OS disk. Type 'bootrec /fixmbr' to restore the master boot record.

and if that doesn't do the trick... reboot off the DVD and execute ALL 3 of the steps listed below?

Method 2: At the command prompt, successively type each of the following commands followed by a CR:
bootrec /FixMbr
bootrec /FixBoot
bootrec /RebuildBcd

Makes any sense?

Mark
My System SpecsSystem Spec
31 Jan 2014   #6
mjf

Windows 7x64 Home Premium SP1
 
 

Quote   Quote: Originally Posted by markg2 View Post
WHY go through all of Andrew's steps if all I have to do is simply type:......
You were given alternate opinions (and links) which you chose to ignore.
My System SpecsSystem Spec
31 Jan 2014   #7
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

The command promt fixes never worked for me. Best is to do a startup repair 3 times. Make sure you reboot after each time.
My System SpecsSystem Spec
31 Jan 2014   #8
mjf

Windows 7x64 Home Premium SP1
 
 

Startup repair is another option but takes longer and isn't solely focused on fixing the boot chain - Bootrec is. I haven't had a problem with Bootrec but wouldn't reject startup repair. I have had startup repair hang on me.
Now you have another option.
My System SpecsSystem Spec
15 Feb 2014   #9
markg2

Windows 7
 
 

Results:

bootrec /FixMbr-->Operation completed successfully
bootrec /FixBoot-->Operation completed successfully

bootrec /RebuildBcd-->Total identified Windows installation=0, Operation completed successfully

How can the operation be successful if there was no Windows installation found????
My System SpecsSystem Spec
15 Feb 2014   #10
mjf

Windows 7x64 Home Premium SP1
 
 

Post a disk management screenshot.
(You need an active partition)

I also refer you to
http://support.microsoft.com/kb/927392
in particular

"If rebuilding the BCD store doesn't resolve the startup issue, you can export and delete the BCD store and then run this option again. By doing this, you make sure that the BCD store is completely rebuilt.

To do this, type the following commands at the Windows RE command prompt:
  • 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
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 Which MBR fix is correct?




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