GFI Languard Network Scanner is a good network administration tool. And when you install it, it runns a Script that stores information in the Registry file, so because of so many viruses do this to trigger them selves any time the machine starts, Norton Antivirus and Norton Personal Fire Wall, stops this kind of action and ask's you if you agree that execution. Don't be afraid, you can leave it do it's work else LanGuard will not be able to do some things (like upgrade). And a litle more, you can find a vbs cript on youre hard drive named UnInstallScript.vbs that performs the remotion of the keys stores into youre registry, so when you uninstall the LanGuard, i'm shure that Norton Will ask you again.

xDrack.