Block still works fine here when using DDU.This is very good advice but be aware that Win 10 will download and install the default driver immediately it sees the GPU has no driver (the old block for this no longer works) so it is very important to disconnect from the internet before using DDU and don't reconnect till you have finished installing your desired driver.
I had MP in a bootloop on startup when using the latest 417.01 drivers. Just rolled back (after cleanup in SafeMode with DDU) to 416.94 and most seems to work.
It seems ambilight is broken with an D3DERR_INVALIDCALL error :'(