Well I was getting the exact same message when using IE11 so it's not your computer. It was using 100% of cpu and just froze my laptop each time. I've upgraded to windows 10 in last couple of weeks & now using MS Edge instead of IE and so far so good.'NSC is not responding due to a Long Running Script' is a message that keeps coming up. I realise that could be anything (and it could be something that is on my computer, not NSC), but if you are able to identify and eliminate it, that would be great.