Dual Boot, Windows 7 + Windows 10, with UEFI only

[Leinahtanwc]

I have been trying to install both Windows 7 and Windows 10 on the same system due to earlier complications involving a driver conflict in Windows 10: http://www.tomshardware.com/forum/id-2896363/blue-screen-death-haunting.html#17125602

However, now I am having more problems: I installed Windows 7 on an old SSD Hard Drive and then proceeded to Install Windows 10 on the M.2 Drive. The order of the installation was done so that Windows 10 would see Windows 7 and make it an option to boot to. The situation becomes more complicated since I am trying to do this all within UEFI. On bootup, I was presented Windows 10 and Windows 7, and booting to Windows 10 was fine at this point. However, when I selected Windows 7, it would not boot, since some software/hardware change is causing a problem.

The Motherboard I have is an Asus Sabertooth x99. For the most part the Bios has been left untouched from its settings (but has been updated to the newest Bios). The boot order is what is peculiar now - it is showing something along the lines of (if I am getting this wrong, sorry), Master Boot Record (Corsair xxxxx), instead of just drives now. I assume this is due to UEFI.

Just so everyone knows, I installed Windows 7 via USB via UEFI (I think). I created the UEFI USB by using Rufus, selecting GPT partition, and selecting a Windows 7 Enterprise ISO file.

*Just so everyone knows: When I first installed Windows 7 and booted to it, it worked fine (minus the part of Windows Update never updating). When I installed Windows 10, it also appeared to be working fine, but when I then tried to load back into Windows 7, it wouldn't.

What I am trying to do:
Trying to Install Windows 7 Enterprise on SSD (Old Corsair), used for Basic Remote Work/VPN
Trying to Install Windows 10 Pro on M.2 (Samsung Pro), home use and work.
Trying to have the dual boot handled by Windows 10 (Teal Screen), instead of Black/White Screen (Windows 7)
Trying to do this all within UEFI, and limit everything to UEFI for simplicity
Trying to understand how UEFI works. Each Installation seems to tamper with the Boot Order and Names.

What I need help with:
Steps for reinstalling both OS's (I broke the boot sectors when repairing, need to reinstall).
Steps for setting up BIOS to make this simpler with respect to UEFI. Should I turn on/off certain settings? In the CSM (compatibility)?

What I have on hand:
The Lovely Computer with an M.2 and SSD installed.
Windows 10 Pro Disc
Windows 7 Enterprise on USB, created via Rufus via these instructions: http://www.eightforums.com/tutorials/15458-uefi-bootable-usb-flash-drive-create-windows.html
Motherboard Disc (Useful for Win7 Installation since it can't connect to internet)

 

[Lutfij]

I'm awfully curious with your setup since you've stated using eightforums for an image creation for Windows 7 USB installer though have you gone through this tutorial for Dual Booting Windows 10 and an older OS?

Just for relevance's sake can you list out your full system specs? If owning an Nvidia card then the drivers are causing an issue within your OS. Also try sfc / scannow for Windows 7 in safe mode.

 

[Leinahtanwc]

I reinstalled Windows 10 and Windows 7 again. The second time through it did not get corrupted and I think I know why. The first time I installed both OS's, I renamed the SSD harddrive from "New Volume" to Win7Core, which may have made Windows 7 go berserk when I tried to boot into it. This time around, I hid the SSD hard drive while in 10 to prevent any future cross corruption.

Of course, all of this still hasn't fixed my BSOD's. However, this time the BSOD said "Pointer Error" instead of the "Corrupted Driver" error. It BSOD right when reboot was selected. This has only occured once so far and has not been duplicated as of yet.

 

[Lutfij]

Understood though you haven't listed your systems specs

Have you tried memtest86+ for at least 5 passes?