I think this problem started when I was using the Software Updater and whatever it was updating (might have been Google Chrome, I'm not sure though) got stuck and hadn't even started after ages. I saw the high CPU then, so rebooted but I've just noticed it's still doing it, specifically the NG Front End or aswFe.exe, so I'm going to try uninstalling just the NG component (and Home Network Security which I don't need) and see if that fixes it.
