Basically Arma 3 doesn't start, it crashes upon the Arma GFX/Loading bar popping up on screen.
I've been trying for the past two days to fix this, but I've had no luck.
I've got some screenshots to explain what's happening.
Arma Launcher & Arma loading bar - http://i.imgur.com/js6fStJ.jpg
I then get this issue, where the loading bar etc just turns into a white block - http://i.imgur.com/Lw0OWDN.png
Then I get this - http://i.imgur.com/emHeOey.png