I've tried that. I disabled all mods (such that applying patches in abyss_log.txt should have an empty list), and I disabled ExtraThreads.
The patched client still doesn't work, I'm back at square one and all I've learned is that dinput8.dll works.
I still think I might be missing a DLL file or library. But since I've already installed all of the VC++ Redistributables (2005, 2008, 2010, 2012, 2013), then I don't know what is missing so that I can go install it. My current OS on my old hard drive must have it, but my new OS on my new hard drive does not have what I need. I don't know how I am at fault as all I've done is install Windows 7, all it's updates, and Mabinogi. I'm not doing this just to be a tech support nightmare: I really don't know what prerequisite(s) I'm missing. Looking into the Unofficial Tiara thread, I'd tried downloading dotNetFx40_Full_x86_x64.exe and KB2600211, but it tells me I already have those installed,