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So after 16 hours with (largely unhelpful) support, I went and blasted through the 100+ windows updates I didn't take for ages. The one you want is an "optional" update called "Platform Update for Windows." in my case it is for windows 7 and is tagged (KB2670838).
This is a direct X issue. Where 9 was a separate piece of software and updated as such, DX11 and 12 are part of windows so need to go through windows updates. Solved my problem (at my own suggestion to them).
I cannot answer for your DX12 issues but it might stem from the same place.
I can attest to this windows platform update WORKS !!!! i had like 120 updates not installled, but i only selected this ONE update..
Platform Update for Windows (KB2670838).
I am on windows 7 ultra 64bit.
This worked !!!! This is all i did..installed update, rebooted, opened origin..BAM it works.