Having just installed the November 2015 Windows updates (Windows 7 Home Premium), I discovered that the NIS icon was missing from the system tray.
So I switched off my pc and started it up again. Still no NIS.
Next, I clicked the Windows 7 start button and found the NIS shortcut, but NIS would still not open.
So I had to do a system restore to just before the Windows update.
In doing so, System Restore eventually told me that my computer was unable to start and proceeded to fix it.
It eventually started and, behold, NIS is back again.
Has anybody else had this problem?
I'm reluctant to try installing the Windows updates again until I can find out why this happened.