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
LVL 19
*** Hopeleonie ***IT ManagerAsked:
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Kanti PrasadCommented:
Hi

Take a back up first "bcedit /export"  and then run  "bcedit /delete" command. Have a look at the below link

http://www.nextofwindows.com/how-to-remove-earlier-version-of-windows-in-windows-7-bootloader-with-bcdedit-command-line-utility/
McKnifeCommented:
Hi.

Boot setup, then press shift f10. A command prompt appears. Enter these lines:
diskpart
List disk
Select disk x
Clean

(x being your disk's number). Then continue with setup.
REITCommented:
Hi,

They can be removed using MSConfig if you can boot into the OS. But if you cannot boot into the OS use EasyBCD to remove the orphaned/un-needed entries.

I would create a Bootable USB of EasyBCD and then remove the entries.

EasyBCD Free Download: https://neosmart.net/Download/Register/1

EasyBCD Bootable USB Guide: https://neosmart.net/wiki/easybcd/basics/creating-a-bootable-usb/
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*** Hopeleonie ***IT ManagerAuthor Commented:
@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.
REITCommented:
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.
McKnifeCommented:
Not only diskpart. That is winPE.
*** Hopeleonie ***IT ManagerAuthor Commented:
@Roshan Ejaz
I only see Windows 7

Win 7
@McKnife
Will try diskpart and bcedit now
David Johnson, CD, MVPOwnerCommented:
if you choose legacy boot from hard drive your system should boot.
*** Hopeleonie ***IT ManagerAuthor Commented:
@David
Hi David

I will have to change legacy boot again for Windows 10?
David Johnson, CD, MVPOwnerCommented:
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.
Maidine FouadEngineerCommented:
Its easyer to Use EasyBCD , the 2.3 Beta Supports Win 10

EasyBCD-2.3-Beta-1-.png
If you wish to proceed with Bcdedit  ...  Run It in Administrator Privilege:

It will let you see what os starts as default in WBM section, you can also see the name and identifier of the Os.

expert.png
Current
For example if want to Delete Windows 7 (description) that has as identifier {aaaaaaaa-bbbb-eeee-ffff-cccccccccccc}

bcdedit /delete {aaaaaaaa-bbbb-eeee-ffff-cccccccccccc}

Open in new window

*** Hopeleonie ***IT ManagerAuthor Commented:
@Fouad Maidine
Can I use EasyBCD if I have Windows 7 Pro and Windows 10 Pro?
*** Hopeleonie ***IT ManagerAuthor Commented:
@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
McKnifeCommented:
You didn't execute the commands.
The clean command wipes the whole disk and all boot entries with it.
*** Hopeleonie ***IT ManagerAuthor Commented:
@McKnife
So I have to reinstall the test client again?
I will do that tomorrow.
Maidine FouadEngineerCommented:
@hopeleonie

Yes you can use Easy Bcd if you have 7 Pro and 10 Pro
David Johnson, CD, MVPOwnerCommented:
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
McKnifeCommented:
> So I have to reinstall the test client again?
For the diskpart clean way, yes.
*** Hopeleonie ***IT ManagerAuthor Commented:
@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
*** Hopeleonie ***IT ManagerAuthor Commented:
David ID:40899263 was very close. The solution is to reset the Bios.

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*** Hopeleonie ***IT ManagerAuthor Commented:
@to all
Thanks a lot
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