Install VirtIO Drivers

From the Windows Recovery Console

# load drivers into memory
drvload vioscsi.inf
drvload viostor.inf

# check to see if disks are now accessible
wmic logicaldisk get deviceid, volumename, description
# or
diskpart list disk
diskpart list volume

# load the drivers into the mounted operating system, assuming its on E:\
dism /Image:E:\ /Add-Driver:D:\vioscsi\2k16\amd64\vioscsi.inf
dism /Image:E:\ /Add-Driver:D:\viostor\2k16\amd64\viostor.inf