Second stick in slot A1 prior to Memtest freezing up
Here is the second stick in A1 slot before it froze
https://imgur.com/ybQ7dzI
Here is the second stick in A1 slot before it froze
https://imgur.com/ybQ7dzI
Can you get into system restore from a boot disk?
Is the mobo still under warranty, did you try the new ssd, do you have an HD maybe sata to try?
Just a thought and seeing as Memtest seems to report CPU: 0 issues. Have you removed the CPU and checked for any bent socket pins? Or it could be one or two not making great contact.
I found a similar forum post and it turned out to be the CPU.
If you can't boot the windows CD then it's not the fault of the OS as the bios takes care of primary boot operations.
How about updating the bios?
Did you try booting from a USB stick. Download this,
http://tinycorelinux.net/10.x/x86/release/TinyCore-current.iso
and install it to a USB stick with Rufus. Then set to boot from the USB in the bios. Also make sure all unneeded peripherals are removed including the mouse, just have keyboard.
Did you try increasing the memory voltage a step