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Dual Booting Question?

post #1 of 21
Thread Starter 
I am wanting to make a dual boot on my already Win 10 allocated SSD. I have read two different things and now not so sure.

I have Win 10 as my Primary Op system and want to install Win 7 home.

Do I just follow the part for under AOMEI in this post or is there another magical method? I just don't want to start from scratch or corrupt everything I have atm. I need Win 7 to run most my older games.

http://www.disk-partition.com/windows-10/dual-boot-windows-10-and-windows-7-8-0528.html

Thx.
SkunkWorkZ
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SkunkWorkZ
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post #2 of 21
That's bogus,
If you follow those directions your Win 10 won't be bootable any more.

Using "Official" MS methods there is no way to install an older OS (like Win 7) after you have installed a newer (like Win 10) OS.

When Win 7 was written MS had no idea how Win 10 would boot, so they couldn't provide any method for installing it after win 7 (an older OS) was already installed. MS is smart, but they can't see 6 years into the future.( Win 7 was released in 2009 and Win 10 in 2015.)

Ms does supply a "tool" to edit Windows boot configuration data in Win 7 and beyond. and that tool can be used (in addition to many other things) to repair the mayhem that occurs when people do what you want to do. That tool is called BCDEdit and it's built into all OS's, win 7 and beyond.

But there's a much easier program to use that is also free. It's called EasyBCD.

After you install Win 10 and the slap Win 7 over it (and win 10 goes away), you use EastBCD to change the boot configuration data in Win 7 to make both OSs bootable. You'll be booting off of the Win 7 boot loader, but once you get into Win 10 you can change to the Win 10 boot loader.

Of course installing Win 7 first and then win 10 over that is the easiest and safest way to go.
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post #3 of 21
Thread Starter 
Thanks, I ignored that website on shrinking to table and just tried to partition a new area of the drive. All seemed to go well till the reboot... I had to enter the boot menu and select back to win 10 cause it wouldn't allow Win 7 on the drive...

Maybe I did it wrong... I created a separate partition from the Primary boot drive and tried to install Win 7 on the new partition rather then the primary drive..

Its a PITA for sure... I may try again sometime but i was able to remove it all back to one drive safely..

I can try to take another crack at it later on.

Thx..
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post #4 of 21
When you "install to" a drive all you're doing in selecting the drive that the Windows install program will put the Windows folder onto. You are not selecting the boot drive.

Background:
In order to any computer to boot up it has to be able to find the OS that is installed on it.

Long ago, in a far, far away place, before there was even an MSDOS , it was decided that when any computer boots it would read a tiny bit of code from the first sector of the boot drive (the "boot sector") and would load that code into memory and run it. That code tells the computer where the boot loader is for the installed operating system, ie, what drive and what partition the Windows folder is on. The computer then runs the boot loader which loads (boots) the operating system.

When you install Windows (or any other OS), it writes it's tiny bit of code to the boot sector of the boot drive. How does it know which drive is the boot drive? The boot drive by default is the drive connected to the first drive port on the motherboard (Drive 0). You can change it to be any other drive though (with the BIOS) if you want to.

So, do you see that the "boot" drive and the "install to" drive don't have to be the same drive?

The problem is that when you install a second OS it re-writes the boot sector to point to it's boot loader.

MS has made Windows Install to be aware of there already being code on the boot sector. So instead of re-writing the boot sector it installs the new OS's boot loader which is a boot loader that points to both OSs, and gives you a choice screen where you can choose which OS the computer should load (boot).

But, as I said in a previous post, an older Windows Install can not "see" the code on the boot sector if that code was put there by a newer OS.

So, when you install an older OS over an newer OS, the Windows Install program's boot loader only points to the newly installed OS, not to both OSs.

There are two way to get around this:
Disconnect the drive with the current boot sector, boot loader, and OS on it. Install a new drive and install the older OS to the new drive (which will become the boot drive in the BIOS). Then reconnect the original drive. Then to change OSs you boot into the BIOS and change the boot drive to the one that has the OS on it that you want to use.

Load the older OS over the newer OS and use BCDEdit or EasyBCD to modify the now screwed up boot loader (that only points to the newly installed, older OS) to point to both OS's and thus give you the OS choice screen.

I can tell you from personal experience that the former is a PITA to use (for a number of very good reasons) and if you do it that way you will eventually redo it the latter way.

And a little aside:
You can install the same OS as many times as you like, your key will work on them all up to the limit MS imposes, which, for WIn 10 I believe is currently 4 installs. Beyond that you have to call MS and talk then into doing an over the phone authentication.

You can install as many different windows OS's as you want to up to the limit of 64 on one boot loader.
 
 
Edited by billbartuska - 9/27/16 at 10:59pm
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post #5 of 21
Thread Starter 
So that all makes sense, so are you saying I can just install Win 7 home on the same drive booting from win 7 CD and just install , then after change the boot order around with BCD?

Thx.
SkunkWorkZ
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post #6 of 21
Yes, I've done it a few times.

You may even be able to use your Win 10 iso ":repair" the Win 10 that won't boot. But I've never don it that way.
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post #7 of 21
Thread Starter 
Well I did a seperate Partition on my Primary drive to install Win 7 on. It istalled went to reboot and I get the option menu Win7 or win 10, At that i select Win 7 and it gives me the Error code C0000428 I have tried a few things but no go.

I went into the BIOS and tried a few settings and so far no good. Seems it may be the Legacy devices VS UEFI and not to sure on all that.

I tried EZBCD but maybe that I don't understand.. If your up to it I can do a teamviewer if you think you can give a once over..

Thx
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SkunkWorkZ
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post #8 of 21
Error 0xc0000428 is a digital signature issue. My guess is that the Win 7 you installed has unsigned drivers in it.

Try disabling Driver Signature Verification in Win 10.
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post #9 of 21
Thread Starter 
OK, I will try that... Now doing this should allow the boot up to win7?
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SkunkWorkZ
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post #10 of 21
Thread Starter 
Quote:
Originally Posted by billbartuska View Post

Error 0xc0000428 is a digital signature issue. My guess is that the Win 7 you installed has unsigned drivers in it.

Try disabling Driver Signature Verification in Win 10.


Aughh.. so frustrating, I get a few errors no matter what i try. It is say GPT error cant install to this drive and so on.... Well I wonder if i shouldn't just Wipe the system and start over with Win 7 first then try to add win 10...

So should I go that route should I divide the M.2 with a partition or leave it as one drive C:\ and do I need to GPT or MBR the format?


Thx.
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SkunkWorkZ
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