Pawgy

Try a search at full system level for WOFF.exe and see how many versions you find. There should only be one, found at your main install location. If you find another, go to the folder as that may be the missing one you are looking for.

(System_Specs)
Case: Cooler Master Storm Trooper
PSU: Ultra X3,1000-Watt
MB: Asus Maximus VI Extreme
Mem: Corsair Vengeance (2x 8GB), PC3-12800, DDR3-1600MHz, Unbuffered
CPU: Intel i7-4770K, OC to 4.427Ghz
CPU Cooler: Cooler Master Seidon 240M Liquid CPU Cooler
Vid Card: ASUS GTX 980Ti STRIX 6GB
OS and Games on separate: Samsung 840 Series 250GB SSD
Monitor: Primary ASUS PG27AQ 4k; Secondary Samsung SyncMaster BX2450L
Periphs: MS Sidewinder FFB2 Pro, TrackIR 4