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Bootmgr is missing

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(@wotsits)
Reputable Member
Joined: 10 years ago
Posts: 253
Topic starter  

I was playing around with the partitions on my computer and have ended up in some trouble.

When I restarted the computer it said Missing operating system - I used diskpart in CMD to set Drive C as the active volume.

Next time I restart it says Bootmgr is missing. I've tried countless things in CMD and going to startup repair in the Windows install disk. Nothing solves it.

I'm at the point where I'm thinking of just installing Windows again -

1 - Will this solve it?
2 - Will I love all files and saved data that was on the drive before that if that's what I do?


   
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altylets1974
(@altylets1974)
New Member
Joined: 9 years ago
Posts: 3
 

That's problem might be solved…


   
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passcodeunlock
(@passcodeunlock)
Prominent Member
Joined: 9 years ago
Posts: 792
 

Boot a live media and check with fdisk which is your active partition. If it is not the one it should be, override and set it manually, this can solve your issue without any system reinstall.

Sometimes the partition ordering and flags are changed in unwanted ways, it's Windows misbehavior (


   
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jaclaz
(@jaclaz)
Illustrious Member
Joined: 18 years ago
Posts: 5133
 

Sometimes the partition ordering and flags are changed in unwanted ways, it's Windows misbehavior (

Naah, this wont normally happen, specifically, in this case, it is a "Wotsits" bug 😯 , not a "Windows" one roll

I was playing around with the partitions on my computer and have ended up in some trouble.

jaclaz


   
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passcodeunlock
(@passcodeunlock)
Prominent Member
Joined: 9 years ago
Posts: 792
 

Hehe, from now on I call this wotsit's bug then )

wotsits let us know if marking active the right boot partition solved the problem without reinstall


   
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jaclaz
(@jaclaz)
Illustrious Member
Joined: 18 years ago
Posts: 5133
 

Well, it's not like it is really binary 0/1 or On/Off, besides making the "right" partition active there are lots of things that can be done BEFORE reinstalling, including running (from a PE) BCDBOOT or using a bootmanager like grub4dos to chainload the current BOOTMGR and \boot\BCD.

Hint
Normal booting chain on Vista and later on BIOS
BIOS->MBR->PBR of Active Partition->BOOTMGR (in root of same partition)->\boot\BCD (still on same partition)-> Winload.exe->Windows

Alternative BOOTMGR (should the original one be actually be deleted/corrupted) in 7 and later is in \Windows\boot\PCAT\BOOTMGR

Only seemingly unrelated
http//reboot.pro/topic/20674-solution-spyhunter-made-windows-7-unbootable/

jaclaz


   
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