JavaScript disabled! You'll have a better experience here if you enable it.

Nov 132012
 

windowsrepairSo you’ve managed to hose the bootloader on your computer? No worries, every Geek has.

This article will show you how to:

- Fix the Windows Vista bootloader

- Fix the Windows 7 bootloader

- Fix the Windows 8 bootloader

***warning – Messing with this stuff is potentially dangerous to your PC. I am not responsible for what you do.

Option 1 – Standard Bootloader Repair

1 – Boot from the Windows install or repair CD appropriate to you version of Windows.

For Windows 8:
1 – Boot from repair disc > Choose Keyboard type > click Troubleshoot > click Advanced options > choose Automatic Repair
if that fails then use:
2 -Boot from Recovery disc or Install disc

-Boot from repair disc > Chose Keyboard type > click Troubleshoot > click Advanced options > choose Command Prompt

or

-Boot from Install disc > Click Next > click Repair your computer > click Troubleshoot > click Advanced options > choose Command Prompt

type > bootrec /fixmbr (writes mbr but does not overwrite partition table)
type > bootrec /fixboot (writes new boot sector to system partition)
type > bootrec /scanos (scans for other OS’s that you might want to add to bcd)
(personally I find the above unneeded and only use the last step)
type > bootrec /rebuildbcd (scans for other OS’s, unlike rebuildbcd it allows you to select the OS’s you want to add to bcd)
Reboot
For Windows 7 and Windows Vista
Boot from the repair disk > Choose keyboard and click Next > Use recovery tools… and click Next > Windows may find problems fix them and reboot, if it works great. If it didn’t work or it didn’t find problems continue on > choose Command Prompt

or
Boot from the Install disk > Choose keyboard and click Next > Use recovery tools… and click Next > choose Command Prompt
type > bootrec /fixmbr (writes mbr but does not overwrite partition table)
type > bootrec /fixboot (writes new boot sector to system partition)
type > bootrec /scanos (scans for other OS’s that you might want to add to bcd)
(personally I find the above unneeded and use the last step)
type > bootrec /rebuildbcd (scans for other OS’s, unlike rebuildbcd it allows you to select the OS’s you want to add to bcd)

Reboot
For more info see: Use the Bootrec.exe tool in the Windows Recovery Environment to troubleshoot and repair startup issues in Windows

 

Option 2 – The Nuclear Option
This option is basically going to give you a new MBR and bootloader. I’ve used this quite a bit. Most recently I used it after removing Windows 7 from a dual boot and moving the Windows 8 partition up (via True Image). Anyway boot as above and use these commands:
bootsect /nt60 c: /force /mbr
bcdboot c:\windows /s c:

 

What these commands do:

Writes a new mbr to c:
bootsect /nt60 c: /force /mbr
( command, /nt60 = use boot code that is compatible with BOOTMGR, / = force dismount, / = write mbr )
( bootsect does to touch mbr, it works on the selected drives…ahem….wait for it…bootsector)

Write a new bootloader to the C: drive
bcdboot c:\windows /s c:
( command, look in c:windows for files, copy files to c: (actually c:\windows\boot) )

 

For more info see:

Bootsect Command-Line Options
BCDboot Command-Line Options

 

EasyBCD

For dual-booting and other boot related projects I use EasyBCD.

I highly recommend you check out this FREE program.

Dual-booting as well as bcd backup and repair are just some of the things you can do.

In addition the site is a wealth of information (check out the blog as well as the forums).

 

-END-