I need some help with a bit complex Windows 10 dual boot situation..

It's not a subject I know about but I kept these links with a note that they were the best advice on the subject:-
Boot into a vhdx file [Kari] - TenForums
NavyLCdr alternative, simple dual-boot method [post #5] - TenForums
Hyper-V virtualization [Pro-only] - Setup and Use - TenForumsTutorials

@Bree - Since this OP's best solution might well be a VirtualMachine [VM] could you step in here?


Best of luck,
Denis

pveeningen said:

... automotive related software ...

Do try searching the forum as well as pursuing your own thread. Needing Win7 because of automotive software seems such a familiar tale [from about five years ago] that I think there must be other threads about it.

Oh dear, this might have been a bad suggestion. The word maintenance is used so much that it just swamps attempts to find it used in relation to automotives.
These are all I could find and I don't think they are are going to help you. The first link [from 2020] is probably what my vague recollection was of.
Vehicle service DVD needs IE to run - TenForums
Problem running Mercedes EWA/ECP/WIS - TenForums


Best of luck,
Denis

---

Welcome to TenForums.

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pveeningen said:

I bought a new laptop which i am going to use for automotive related software.
Wherefore i absolutely need Windows 7 32 bit....... .....All tips are welcome! And thank you for reading!!

Try3 said:

@Bree - Since this OP's best solution might well be a VirtualMachine [VM] could you step in here?

I have 32-bit Win7 as a Hyper-V VM with an MBR install. As an experiment I've tried copying its .vhdx onto a UEFI/GPT laptop and tried to native-boot it. I couldn't set it up, BCDBOOT reported it couldn't copy the boot files.

I agree, a good solution may be to run Windows 7 32-bit as a VM. But for automotive software it's probably going to need direct access to the hardware, such as USB ports. Hyper-V does not allow that, all hardware is virtualised. Oracle VirtualBox may be more appropriate in this case as it does allow direct access to the host machine's hardware.

Oracle VM VirtualBox

You did everything right. Each OS has it's own drive and should be independent.
I have almost the same as you do. Only thing is that I have a desktop and Win 7 x64.
The fact the Win 7 got un boot able is an accident and probably can be fixed.
Did you detached the M.2 drive before you begin win 7 installation on the SATA drive?
Do you press F12 during post to launch the one time boot menu?
Win 7 doesn't boot. Is there an error message?

Please post a whole window Disk Manager image of ALL your drives. Don't forget to expand the columns so we can read them. How to Post a Screenshot of Disk Management
If you have a MiniTool or AOMEI Partition use it instead or Windows disk manager.