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I had my laptop running both Windows 7 and Windows 8 as a dual boot. When I would start it, it would show the nice OS selection screen.

Then, I reinstalled Windows 7. What happens now is that when I start my laptop, there's no OS selection screen, it loads Windows 7 right away.

The Windows 8 partition is still there, I can see it in My PC, so I guess it's a matter of fixing the dual boot. However I can't find how to do that in this case.

How do I repair my dual boot windows 7 and windows 8 bootloader?

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2 Answers 2

Get a WinPE boot disk or a MSDaRT boot disk and use BCDEdit. It's a command-line tool for managing BCD stores. It can be used for all kinds of stuff, including creating new stores, modifying existing stores, adding boot menu options, and for fixing stuff like this. BCDEdit is like Bootcfg.exe on earlier versions of Windows but better.

http://technet.microsoft.com/en-us/library/cc709667(v=ws.10).aspx

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But if my system is loading fine Windows 7, do I need a boot disk? Can't I just use the BCDEdit tool? –  Albert Apr 10 '13 at 16:02
    
You need to repair the WIndows 8 bootloader, use WINPE to do this. –  Ramhound Apr 10 '13 at 18:37
    
Using bcdedit can only add boot entry in BCD for Win 8 but it cannot fix boot for Windows 8. Boot manager (and other boot related files) should be fixed too! Windows 8 boot loader (winload.exe) does not need fixing it is fine. –  snayob Apr 14 '13 at 19:09

"Dual-boot Repair" tool (comes with Visual BCD Editor) can fix the issue automatically on click.

Just click Dual-boot Repair -> "Automatic Repair". It will add Windows 8 to boot menu and fix boot files for dual-booting Win 7 and Win 8.

Visual BCD Editor can be downloaded from http://www.boyans.net

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