My problem was that my keyboard worked but the game wouldn't accept mouse input. After several hours of fussing and fuming I found a very simple solution. All I needed to do was press alt and shift at the same time in the game window after it loaded fully.
I'll list my computer specs in case that is relevant:
Chassis : Desktop
Mainboard : ASUS CROSSHAIR V FORMULA-Z
BIOS : AMI (OEM) 2201 03/23/2015
Processors
Processor : AMD FX(tm)-8350 Eight-Core Processor
Memory Module(s)
Memory Module : 4x G.Skill F3-2400C10-8GTX 8GB
Video System
Monitor/Panel : 2x ACR XG270HU
(2560x1440, 27.0")
Peripheral: HTC Vive
Video Adapter : 2x MSI VCX RX 580 8G GDDR5 256B PCIE
Storage Devices
AMD 4+0 Stripe/RAID0 (446.9GB, RAID, SCSI-4) : 447GB (C:) (E:) (F:)
Disk (17.2GB) : 16GB (D:)
Disk (7451.9GB) : 7452GB (G:)
ASUS BW-12B1ST a (SATA2x1, BD-RE, DVD+-RW, CD-RW) : N/A (H:)
Network Services
Network Adapter : Intel(R) 82583V Gigabit Network Connection (Ethernet, 1Gbps)
Operating System
Windows System : Microsoft Windows 10 Professional 1709 10.00.16299.64
Platform Compliance : x64
Input Devices
Keyboard : Logitech G510S
Mouse : Logitech G502 Proteus
Peripheral : Logitech G13 Gameboard
Post edited November 18, 2017 by Llewen