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*** Hopeleonie ***
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How to delete Windows 10 Boot Managers?

Hi

I have reinstalled Windows 10 beta twice on my test laptop. But when I install Windows 7 now it will no more boot. I will just see a black screen.
Sometimes I event can’t format the old partitions with the Windows 7 DVD. Then I have to delete all Partitions with a Paragon recovery Linux CD. I think the problem is because the Windows 10 Boot Managers?

PIC
If yes how can I get rid of them both?

Any help would be greatly appreciated
Windows 10Windows 7Windows 8Windows OSMicrosoft Legacy OS

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*** Hopeleonie ***

8/22/2022 - Mon
SOLUTION
Kanti Prasad

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McKnife

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*** Hopeleonie ***

ASKER
@Kanti Prasad
I will try the bcedit command

@McKnife
diskpart will work with Windows 7 DVD?

@Roshan Ejaz
How can I remove it using MSConfig? I think EasyBCD will not work for me as I have Windows 7 Pro and Windows 10 Pro.
REIT

Type MSConfig into a run command, then click the Boot tab, then remove the entries for Windows Boot Manager which are listed for OS's that no longer exist.
McKnife

Not only diskpart. That is winPE.
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*** Hopeleonie ***

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@Roshan Ejaz
I only see Windows 7

Win 7
@McKnife
Will try diskpart and bcedit now
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*** Hopeleonie ***

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@David
Hi David

I will have to change legacy boot again for Windows 10?
David Johnson, CD

no you don't have to.. it just means that you are defeating the secure boot procedure.. I personally don't know how to modify the UEFI bios to remove entries that are added to it other than re-flashing the bios.
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*** Hopeleonie ***

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@Fouad Maidine
Can I use EasyBCD if I have Windows 7 Pro and Windows 10 Pro?
*** Hopeleonie ***

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@Fouad Maidine
I did bcdedit /delete {aaaaaaaa-bbbb-eeee-ffff-cccccccccccc} but still have 2  Boot Managers

@McKnife
diskpart
Did not help

@to all
I think I have to re-flash my Bios
McKnife

You didn't execute the commands.
The clean command wipes the whole disk and all boot entries with it.
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*** Hopeleonie ***

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@McKnife
So I have to reinstall the test client again?
I will do that tomorrow.
Maidine Fouad

@hopeleonie

Yes you can use Easy Bcd if you have 7 Pro and 10 Pro
David Johnson, CD

EasyBCD will NOT remove entries in the UEFI bios.
http://www.easyuefi.com/index-us.html is one program to edit the uefi boot entries

or boot into a recent linux live cd and use efibootmgr to remove the entry by number, as in:
# efibootmgr -v
Timeout: 10 seconds
BootOrder: 0000,0007,0006,0008
Boot0000* windowsbootmanager(2,1b8,64000,f1b7598e-baa8-16ea-4ef6-3ff3b606ac1e)File(\EFI\Miccrosoft\bootmanager.efi)
Boot0006* Hard Drive	BIOS(2,0,00)SATA: ST32000542AS            .
Boot0007* CD/DVD Drive	BIOS(3,0,00)PATA: HP DVD Writer 1040r     .
Boot0008* INTERNAL EFI SHELL: ST32000542AS	ACPI(a0341d0,0)PCI(1f,2)ATAPI(1,0,0)HD(2,1b8,64000,f1b7598e-baa8-16ea-4ef6-3ff3b606ac1e)File(\EFI\BOOT\BOOTX64.EFI)
# efibootmgr -b 0000 -B

Open in new window

http://bit.ly/1ImJIUB
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McKnife

> So I have to reinstall the test client again?
For the diskpart clean way, yes.
*** Hopeleonie ***

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@Fouad Maidine
We had an EasyRE CD from Neosmart and it coud not fix the problem.

@McKnife
diskpart
List disk
Select disk x
Clean

did not work.

@David
Now I will try efibootmgr
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*** Hopeleonie ***

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@to all
Thanks a lot
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