Are you using avast! as your antivirus product?
It seems that avast! didn’t pickup Gator in my sample files.
Also I don’t recall that Avast detects any adwares? :-\

To uninstall Gator, go to Control Panel → Add/Remove Programs → “and click on the Gator associated program and click the button to remove Gator”

You may need administrative rights to uninstall Gator if you are running NT based systems. Depending on the variant of Gator that you have installed on your computer, there might be some leftovers of Gator on your computer.