I got lost on mine today and got into the dreaded "apps" "charms" or whatever they call them, but I just clicked on the Vaio thingy and hey presto back to where I needed to be
I know everyone says they cant see how to close it down, but it doesn't really seem to be necessary. I just close the lid of the laptop and it goes to sleep, ready for instant action when I open it again. Or you can press the on off button on the laptop which does the same thing
Also if you head the pointer towards the corners of the screen it give you various options. OK you may already know all of this, but I enjoyed myself