Blender takes long time to start / menus malfunction

Blender was taking a long time to start up, maybe several minutes and when it did visual performance was jerky and the menus did not seem to work properly.

Realised that some days before I have, at Windows 8’s insistence, installed NVidia drivers 314.07.

Rolled these drivers back and every thing was fine again.

Thought I’d write it up for anyone else who finds themselves in this position after update.