Can't install NIS: "make sure that network control panel is closed" error message!

Hi guys

 

I can't get Norton Internet Security to install! First everything was fine, and then I got a message saying it needed to be uninstalled and re-installed: no problem, I thought. But then when it came to re-installing, I kept getting the same error message again and again: "make sure that network control panel is closed". I tried the uninstaller and re-installer tool, but it still doesn't work!

 

Can anyone give me some tips how to install it without this error message coming up?

 

M.