Hi, Control Panel was inadvertently changed to classic view, and i seem unable to change it back to the normal Vista view as there are no options to do that in Control Panel. I used the 'help' facility but it was telling me 'To switch back to category view, click Control Panel Home.' But i see no Control Panel home button or wording.
I had Control Panel set to Classic View, as per my earlier screenshot. I toggled it to "Category View" and then back again to "Classic View". Like you, I've now lost the blue panel at the left and can find no way to change between views. Very strange because I was able to switch between the two.