Multi boot issues with Windows 7 and 8

Boston Howie

Reputable
Oct 30, 2014
6
0
4,510
Hi Guys,
I'm trying to install both Windows 7 Pro and Windows 8.1 on a solid state drive .I have tried installing Windows 8 first, Windows 7 first and via usb and DVD boot combinations. If i install Windows 7 first I get the "The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks" blocking me from installing windows 8 into the second partition I created on the solid state drive. (The drive was initially created as GPT but the Windows 7 install must do something to it.)
If I install Windows 8 first and install Windows 7 into the second partition I get the below error with winload.exe on PC restart

File:\Windows\System32\winload.exe

Status:0xc0000428

Info:Windows cant verify the digital signature for this file.

....which prevents me from loading up Windows 7. I can only load up Windows 8.

It appears to be MBR vs GPT issues. Can this SSD support multiboot? Any ideas of a fix? I have also set both operating sustems to default boot but issues persist. Win 7 blocks Win 8 and vice versa.

Thank you!

My stuff:
Solid State Drive:SAMSUNG 840 EVO MZ-7TE500BW 2.5" 500GB SATA III TLC Internal Solid State Drive (SSD)

Motherboard: ASUS SABERTOOTH 990FX R2.0