I think the green update box means 5 - what colour is the pool ball in the system tray? If it is orange you have 5, blue 4.
To confirm Tarq's post, I had an 'irregular' update to 5 - I assumed it was 'digitalis Boacitus' but maybe there is are hiccups here and there. Certainly the 'sound features' were turned on again by default post install. I think the new interface on 5 is better.
If you are having 'issues' AND you have 5, I would concur with Tarq's sequence, and see how a new install goes.