Windows 8.1 Pro x64 + Classic Shell (Windows 10 once drivers roll out and Oculus support)
Drivers [Chipset-IME-Nvidia]
WinRAR
7-Zip x64
CCC Pack
Chrome - Adblock - PDF Viewer
Daemon Tools (I still use this by pure habit)
eVGA PrecisionX
Adobe CS6 Suite
Vegas Pro 12
Logitech Gaming Software
Origin
NZXT CAM
Office
OBS
Go to Services and disable a ton
A lot of things from my previous list still exist but I've limited a lot of installs by adding a 512GB SSD and leave certain things installed. Steam is one good example, as is FRAPS (which I don't normally use). UltraISO, Handbrake, and the like I move over to my server to free up work time on my main rig and because I can remote into it.