Strange boot behaviour ('partial hangs'). Any ideas?

After several days, this has stopped working. I now have the same problem as before, even with the older drivers. maybe this just isn't fixable.
 

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Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Windows 7 Home Premium SP1 64-bit
CPU
Intel Core i7-4790K CPU @ 4.5GHz
Motherboard
Asus H97I-PLUS
Memory
16GB KINGSTON HYPER-X FURY DUAL-DDR3 1600MHz
Graphics Card(s)
8GB NVIDIA GEFORCE GTX 1070
Monitor(s) Displays
HannsG 28" & Dell 24"
Screen Resolution
1920x1200
Hard Drives
1 x 2TB Samsung Evo 860 SSD
2 x 500GB Samsung Evo 850 SSD
PSU
CORSAIR 650W CS SERIES
Case
Thermaltake Core V1 Mini ITX Cube
Cooling
NOCTUA NH-L12
Browser
Firefox
Other Info
Custom PC used for X-Plane 11
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