I like Norton Insight. I guess it's ability to function is part of the browser integration? I recently started using a 3rd party downloader and as such Insight is no longer being activated.
I'm able to have the utility invoke "c:\Program Files (x86)\Norton Internet Security\Engine\18.6.0.29\navw32.exe" to scan the file after it's downloaded, but I'd rather be able to invoke an .exe that would perform the Insight check