All fine until a couple of days ago. The icon was not in the sys tray. I was then given an "error communicating with kernel" message. I uninstalled, but when I tried to reinstall I was told that the installer didn't have the privileges to alter certain files. I'm thus unable to use NOD32,even though I've paid for it, and am forced to use Avira instead. What's going on? I'm the sole user and admin of this computer. All thoughts welcome.