Had a nightmare week, Graphics card died on me and caused unrecoverable error in Windows 10!!
After almost two days of messing about I am finally back up and running using the integrated video card on the motherboard - oh well at least it gives me a more reasonably powered machine to develop on.
On top of that I upgraded to Unity 2018.2 and it broke a LOT of things in the engine, again it's taken a day but I'm finally back to where I need to be.
Game Dev eh? Fun Fun Fun ;-)