My Windows7 i5 laptop has had NIS since new and I've recently upgraded to the latest version.
But it has always had the problem that after leaving the machine idle for a short time, it stops responding.
I think this problem occurs when I've installed some new software, but I'm not 100% sure.
I have switched off the idle-time optimiser and that makes no difference.
When it happens, I see a box at the bottom right of the screen saying "Norton Internet Security is currently performing background tasks while your computer is idle". I can click the x on that box to hide it, but then nothing else responds. I have to power it off by holding down the power key.
I have seen that some people have been able to fix this by running the Norton uninstall and re-install utility but I tried that and it made no difference.
I have just checked in the history and there aren't any Norton tasks showing as running in the time when the machine hung, although there was a message about background tasks running.
I'm generally very happy with NIS but if I can't resolve this I'll be changing to another product.
Any help much appreciated.