On my mac when i rotate the camera i see it moving live so i can position it as i like, however on my pc when i drag the camera i just get this grid system come up and it doesnt update the view until i let go of the mouse.
is there a setting that I should be ticking to enable live preview updates on active camera?
http://i52.tinypic.com/11hdhu1.jpg <--- screenshot of what i mean
Apparently its called "Live Update"
That's the one! :-)
Your screenshot shows live update turned off. It's the second icon from the left. It should be selected.