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Windows 7: Dual Boot - Delete a OS

02 Oct 2015   #120

Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM


You should start your own thread for help with your specific problem.
I'm not sure how or if you can do what you want remotely.

Can you have someone available "hands-on" at the remote PC, so you can give them instructions for what to do ?

I help people remotely, and face the same type of problem, so i'm interested if there is "better solution" than what i know.

My System SpecsSystem Spec
06 Oct 2015   #121

Windows 10 Home 64bit

Hello all,
I need to remove one of the OS on my DELL laptop, when I start it up it gives me the black screen (BIOS?) and I have to choose between Windows 7 & Windows 7...
When I go to Disk Management to follow your tutorial, there are the 3 partitions:
OEM partition
C: Primary partition
E: the System, Boot, Page File, Active, Crash Dump, Primary Partition

But it doesn't show 2x Windows 7 on there. So how do I get this solved? I just want it to start Windows 7 straight away when I start the computer, not ask me which one to start...

Thanks for your help!
(I'm not an expert, so would help if answer is not too technical... Thanks!)
My System SpecsSystem Spec
06 Oct 2015   #122

W7 Home Premium x64 / W7 Ultimate x86

@mchldpy @DavidE
Sorry i just saw your replies, I didn't get any email notifications.

OK well, remotely was not going to happen, so i tried to get it sorted at the week-end while at home. Don't remember how I ended up with that layout on the HDD, apart fro there was another partition there which i deleted, hence the Unallocated space.

Anyway i had the idea of Cloning the Win 8.1 partition to the Unallocated space, which worked, I then used EasyBCD to copy the Bootmgr from the Win7 to the NEW Win8.1 partition (now primary), which also worked, i then figured i could boot into the new cloned Win8.1 and delete the others. Sounded great in theory, but could not get the thing to boot into the new partition, kept booting into the original Win8.1 (and i know it did as I intentionally made them different sizes to tell the difference), even after changing the boot menu with EasyBCD and editing it so the other partition were not even an option, somehow, still didn't work. In the end I got fed up and decided i would just wipe everything and reinstall Win 8.1! However on going that route, i got as far as a missing media driver during the install so couldn't even do that, at that point i gave up and decided to enjoy the rest of my week-end!!

Thanks for looking in though.
My System SpecsSystem Spec
22 May 2016   #123

Win 7 Enterprise x64/Win 8.1 Pro x64

I have a Win 7/Win 8.1 dual boot obviously, in setting this up in the beginning, Win 8.1 was loaded after Win 7.

However, now I would liike to upgrade the Win 8.1 OS to Win 10, leaving Win 7.....resulting in a Win 7/Win 10 dual boot system.

Do I need to delete the Win 8.1 first, then add Win 10 or can I simply somehow upgrade the Win 8.1 to Win 10 on my existing system?

Many thanks in advance....
My System SpecsSystem Spec

22 May 2016   #124

64-bit Windows 10 Pro

Hello TekMan, and welcome to Seven Forums. :)

You could upgrade Windows 8.1 to Windows 10 from within Windows 8.1 without issue, and be dual booting Windows 7 and Windows 10 afterwards.

Windows 10 - Upgrade Installation - Windows 10 Forums
My System SpecsSystem Spec
23 May 2016   #125

Win 7 Enterprise x64/Win 8.1 Pro x64

Many thanks Brink, that's great news....and thank you for the welcome.

But you know what, as I have been sitting here, I just remembered that I've got my Windows 8.1 working on two separate partitions and each partition is on a separate hard drive (C: and D:)....and I changed the registry so that all new programs load onto the D: I'm wondering if Windows 10 will simply not be able to complete the upgrade because of that registry change?? (maybe I could go back into the registry and revert the changes first??)

Here's the system I have now:

--On one hard drive (a solid state hard drive) I have a partition for Windows 7 and Windows 8.1
--On a second hard drive (a SATA drive) I have corresponding data partitions for Windows 7 and Windows

So when I boot up either operating system, the C: drive is the solid state drive and the D: drive is the SATA drive.

I guess I would wonder if I could just load a regular Windows 10 disc (not an upgrade) while I'm in Windows 7 and just pick the partition that Windows 8.1 is now loaded on and just let it load that way??
I think not.....I imagine I would need to delete the Windows 8.1 OS first and then try loading a new Windows 10 system while I'm in Windows 7....just like I did initially when I loaded Windows 8.1 as the second operating system from within Windows 7....??
My System SpecsSystem Spec
18 Jul 2017   #126

Windows 10 X64

Hi, I deleted my second partition, but when it gets the the easybcd part it says you must do steps 4 and 5, but in that picture there is no step 5, or maybe im just blind...

EDIT: nevermind I thought it meant the steps in the picture not the step afterwards... whoops
My System SpecsSystem Spec
18 Jul 2017   #127

64-bit Windows 10 Pro

Hello yotoprules, :)

Sorry for the confusion. It would be for "Step 4 - Clean the MBR" and "Step 5 - Reset MBR with the entry of the current OS" in the tutorial, and not in the screenshots.
My System SpecsSystem Spec
21 Jun 2018   #128

Windows 7 (32 and 64) / Windows 10 on a laptop

Hi! Your tutorial was absolutely clear, but I'd like to be sure before doing something unrecoverable
I've seen similar situations in the post replies, but...

I had a 32bit Windows 7 installed first, and a 64bit installed later. Now I'm sure that I don't need anymore the 32bit version, and I'd like to remove it.
The 32bit is installed on the O: partition on Disk 1 (SSD), while the 64bit on the C: partition (of course, this is the situation as it is seen in the 64bit environment...).
The Disk 2 (HD) is a copy of Disk 1, made before I changed the partitions size on Disk 1...
Dual Boot - Delete a OS-hd.jpg

First question: steps 3, 4 and 5 can be done independently from steps 1 and 2? In my understanding there is no actual dependency... I could clean the boot manager and the BMR, with no need to change something in the HD paritions... Is it correct?

Second question: In my understanding, my BMR is on a partition on Disk 1 without any label ("Active & Boot"). The N: partition is just a copy of that one. Is it correct? The strange thing is that EasyBCD identifies N: as "Easy BCD Boot Device". Is that normal? Should I first label the (*) partition on Disk 1 and move the "Easy BCD Boot Device" to that partition? Or, better, on partition C:? Ok, those are third, fourth, fifth.... many questions :)

So, my intention is to delete the 32bit version entry from the Boot Menu (Step 3 of the tutorial), reset BCD Configuration (Step 4), add the 64bit version as New Entry (Step 5).
After that, if everything goes ok, I should have just one O.S. (64bit) booting without any menu asking for any choice...

After that, I'd like to change my partitions on Disk 1, having just one partition C:. This means that I should delete the O: partition, then add the resulting freespace on the existing C:. Is this the case you called as "add that freespace to a partition that is to the right of the freespace"? Should I "Resize" partition or "Extend" it? What is preferrable? Is it mandatory to use a bootable CD or can I simply manage it through MiniTool Partition Wizard and it will perform actions at the first reboot?

Thanks in advance for your support!

My System SpecsSystem Spec
25 Jun 2018   #129

Windows 7 (32 and 64) / Windows 10 on a laptop

A little update...
I used EasyBCD and made c: as active and boot partition, removed Win32 from the boot menu, reset the BCD, add Win64 in c: as new entry and everything works fine... Win64 boots from c: without any menu... Next step will be to delete the old partition with Win32 and then expand/resize c: to occupy all the available space.
I used AOMEI Backupper to create an image (iso) of the c: partition on an external USB hard disk (image verified to be ok), and then I created with AOMEI PE Builder a USB bootable key with the AOMEI tool that could be used to restore c: partition in case something goes wrong.
I didn't use Partition Wizard bootable version because it seems to be no more a tool available for free. Can you confirm that (the information could be useful for people reading your great tutorial)?
I should be now ready to do the last, risky step....

As suggested by Samuria in another post, I used Partition Wizard deleting the win32 partition and then to move C: on the left. Everything worked perfectly.

Dual Boot - Delete a OS-hd-after.jpg

Only one last step is missing: expanding the partition on the right, but this is straightforward...

My System SpecsSystem Spec

 Dual Boot - Delete a OS

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