"I'm in enough of a bind right now to sign up for a forum! That, like, never happens!"
Just left your situation & know your pain as I myself made my 7-64-bit install work so why so hard of an install?
Well, turns out they dropped Windows 7 64-bit support so everyone else followed along, making it trivial however here's some tips (by now guessing you've solved this?):
-Use Linux or a newer version of Windows to determine your chip(s)
-Usually other mobo vendors use similar chipsets, check their driver lineup & extract key files to see if it works for W764 install (uh I got lucky; Gigabyte had mine, but well hidden).
-Check your BIOS settings. See if MSI have an update for the BIOS or perhaps your board has a bug.
-Reinstall Win7, starting with your mobo BIOS and drivers 1st, ending with your FRUs (Field Replaceable Units [vidcards, ssd, etc] ) and USB Peripherals last.
Hope it helps