I'm new to Ardunio and I'm going mad trying to get the IDE to work. I've downloaded the Windows installer 1.6.9) installed it and when I try to run I get a small splash screen "Arduino cannot run because it could not create a folder to store your sketchbook". I've read through a number of posts where others had similar problems but I can't seem to find anything or relevance to what I can see in my directories. I've been building PCs for years and have a degree in Electronics - but this beats me!
Help gratefully appreciated!