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The time now is Thu 16 Aug 2018, 18:25
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 Forum index » House Training » Users ( For the regulars )
Can't boot windows 7 after installing Grub4dos
Moderators: Flash, Ian, JohnMurga
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Ledster

Joined: 26 Aug 2006
Posts: 83
Location: Devon, England

PostPosted: Thu 18 Jan 2018, 10:44    Post subject:  

Just to clear up a couple of things:

Startup repair has been run from the install dvd several times with no joy.

No partitioning was done prior to this problem. The partitions have been unchanged for several years.

Windows was working ok right up to the time I ran grub4dos.

Must admit I am beginning to have doubts it's an mbr problem, but I don't know of any way to find out other than what I've tried already.

It's a damn good puppy linux computer now!
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bigpup


Joined: 11 Oct 2009
Posts: 10861
Location: Charleston S.C. USA

PostPosted: Thu 18 Jan 2018, 19:19    Post subject:  

Quote:
Startup repair has been run from the install dvd several times with no joy.

That is the really strange part of this.
Startup repair is all about fixing just this type problem in Windows.

The Windows startup repair options should be able to change it back to Windows boot loader.

About mbr.
What Grub4dos config does is replace the Windows boot loader, that is in the mbr, with the one for Grub4dos.
That boot loader is only what boots the computer to a boot menu.
The actual files that boot the operating system are on the hard drive.
For Windows that is the bootmgr file.
Quote:
BOOTMGR eventually executes winload.exe, the system loader used to continue the Windows boot process.

https://www.lifewire.com/windows-boot-manager-bootmgr-2625813
Not sure how, but I think the actual Windows install got messed up.

Maybe Winload.exe is missing or corrupted. Idea
Quote:
Winload.exe Related Errors

If winload.exe has been corrupted or somehow deleted, Windows likely won't work as it should, and may display an error message like one of these:

Windows failed to start. A recent hardware or software change might be the cause


Again.
If you get this far in the Windows boot process, Grub4dos is booting Windows.
Quote:
UUID xxxxxxxxxxxx
chainloader /bootmgr

both sda1 & sda2 UUID versions boot to the "Windows failed to start" screen.

start windows normally gives same as above.
Launch startup repair gives the usual options none of which help.

_________________
I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected Shocked
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mikeslr


Joined: 16 Jun 2008
Posts: 2520
Location: 500 seconds from Sol

PostPosted: Thu 18 Jan 2018, 20:21    Post subject: restores the MBR of hard drive to its original DOS/Win state  

Hi All,

I'm "late to the party" and about to take a break so haven't read this thread from the beginning. But having just read rcrsn51's post here, http://murga-linux.com/puppy/viewtopic.php?p=980653#980653 thought it might be pertinent to this problem.

"This is ms-sys from here. It restores the MBR of a hard drive to its original DOS/Win state. Use it to remove the Grub4Dos bootloader.

For example:
Code:
ms-sys -m -w /dev/sda #write an XP boot record
ms-sys -7 -w /dev/sda #write a Win7 boot record

Use with care.

Remove the fake .gz extension."

Link and applications are available on the cited thread,

mikesLr
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